The Grand Tour star landed himself in hot water for remarks he made about Markle in The Sun, which included him saying he hated her on a “cellular” level.
He also admitted that ITV, which makes his show Who Wants To Be A Millionaire?, and Amazon, which makes Clarkson’s Farm and The Grand Tour, were “incandescent”.
Deadline has now shared a letter apparently penned by McCall in response to a politician’s request to have Clarkson dropped from Millionaire.
She wrote: “Your concerns are completely understandable. ITV has no editorial control over Jeremy Clarkson’s independent journalistic output in The Sun or anywhere else he chooses to publish.
“Everyone at ITV is very aware of our responsibilities as a Public Service Broadcaster and I’d like to be clear that the comments made were Jeremy Clarkson’s own and are in no way endorsed by ITV. There is no place on ITV for the comments made in that article.”
In Clarkson’s article, he said that he dreamed of the day when Markle was "made to parade naked through the streets of every town in Britain while the crowds chant 'Shame!' and throw lumps of excrement at her".
Apologising on Instagram, he said: “I really am sorry. All the way from the balls of my feet to the follicles on my head.
"This is me putting my hands up. It’s a mea culpa with bells on.”
Watch: Ed Balls lays into Jeremy Clarkson over Meghan Markle apology