King Charles is about to lose one of the most powerful men in his royal fortress — and Prince Harry could be waiting to pounce.

Sir Clive Alderton, the King’s feared right-hand man and longtime palace gatekeeper, is stepping down after two decades at the center of royal power.

Now, insiders say his departure could blow a hole in the wall separating Charles from his estranged son — and hand Harry the biggest advantage he has had in years.

Buckingham Palace announced that Alderton, 59, will leave his post as principal private secretary in May 2027. But the fallout has already begun.

Royal experts say Harry has long viewed Alderton as one of the shadowy palace figures who helped poison his relationship with his father and keep the Sussexes on the outside.

“Harry is pretty scathing about Clive in his memoir Spare,” royal reporter Valentine Low said on The Royalist podcast.

Harry never directly named Alderton in the book. Instead, he described three powerful palace aides as “the bee, the fly and the wasp.”

According to Low, Alderton was the wasp.

And the nickname was no accident.

Harry reportedly saw Alderton as smooth, polite and carefully controlled on the surface — but capable of delivering a brutal sting when challenged.

“He’s very sort of charming and courtier-like and self-effacing,” Low said. “But, you know, if you cross him, if you push back — in Harry’s view — you’d learn about it.”

Low even suggested Alderton was the kind of palace operator who never forgot a slight.

“It’s not necessarily a strategically wise thing to get on the wrong side of Clive Alderton,” he warned.

That reputation helped make Alderton one of the most formidable men inside Charles’ inner circle.

For Harry, however, he may have represented something far more personal — the man standing between him and his father.

Harry and Meghan Markle walked away from royal duties in 2020 and fled to California, unleashing years of accusations, interviews and bombshell revelations about palace life.

But behind the public war, Harry has repeatedly suggested that powerful courtiers controlled access to Charles and made any meaningful reconciliation nearly impossible.

Now, one of those courtiers is heading for the exit.

Low said neither Harry nor Meghan trusted Alderton and believed he was loyal to the palace machine above all else.

“There was a certain amount of antipathy,” he said. “Neither Meghan nor Harry liked Clive. He wasn’t their kind of guy, and they didn’t trust him, rightly or wrongly.”

The royal household, Low explained, is less like one united family and more like a maze of rival courts, competing offices and personal power bases.

Harry’s operation was only a small “sub-fiefdom,” while Alderton spoke for the King.

That meant Harry was never fighting on equal ground.

Royal expert Tom Sykes said people close to Harry also blame Alderton for one of the Duke’s most bitter battles — his fight for taxpayer-funded security in Britain.

Alderton sits on the Royal and VIP Executive Committee, known as RAVEC, which helps determine security arrangements for senior royals and other high-profile figures.

Harry has argued for years that he cannot safely bring Meghan and their children to Britain without police protection.

The dispute reportedly became so explosive that it nearly wrecked his July trip to the U.K.

That visit ultimately produced a stunning royal reunion.

Harry, Meghan, Prince Archie and Princess Lilibet reportedly met Charles and Camilla at Highgrove House in Gloucestershire — the first time the King had seen his grandchildren in person in more than four years.

The meeting immediately sparked speculation that the royal cold war was finally beginning to thaw.

But Alderton’s coming departure could transform that fragile opening into something much bigger.

For years, Harry’s allies have portrayed him as locked out by palace insiders who controlled the King’s schedule, messages and private access.

Without Charles’ most experienced gatekeeper standing guard, Harry may finally have a clearer route back to his father.

Sykes cautioned that blaming Alderton for every disaster between the Sussexes and the palace was “a bit absurd.”

Low also warned that his exit would not automatically hand Harry the security deal he wants.

“The palace private secretaries have an input — obviously, their voice is listened to — but in the end, I don’t think it’ll affect it,” he said.

Still, the symbolism is impossible to ignore.

Charles is losing a battle-tested protector at the exact moment Harry appears desperate to repair their shattered relationship.

And after years of being frozen out, mocked and blamed for tearing the monarchy apart, the Duke of Sussex may finally hold a card the palace cannot easily take away.

The man Harry allegedly believed was blocking the door is leaving.

Now all eyes are on Charles.

Will the King use the opening to bring his son back into the fold — or will Harry use the palace shake-up to force a reconciliation on his own terms?

Either way, the balance of power may be shifting.

And for the first time in years, King Charles could be the one left exposed.