The former Top Gear presenter said he felt "sick" upon realising he had "completely messed up", following widespread from public figures, including Harry and condemnation Meghan.
However, the couple cast doubt on the presenter's claim, saying he had written only to Harry.
And Amazon has reportedly cut ties with Clarkson - sources told Variety that Prime Video, the tech giant's streaming service, will no longer be working with the British presenter beyond episodes of The Grand Tour and Clarkson's Farm that have already been commissioned.
The Independent also understands ITV has not made any further commitments to Clarkson beyond the upcoming series of Who Wants To Be A Millionaire?
In the column, published in The Sun on 16 December, Clarkson wrote that he despised Meghan on "a cellular level" and dreamt of the day that the duchess would be made to parade naked through Britain while a crowd chanted "shame" and threw "excrement" at her.
Clarkson claimed that "everyone who's my age thinks the same way".
The original column was met with immediate backlash online, with the press watchdog Ipso receiving more than 20,000 complaints to become their most complained-about article ever.
The 62-year-old initially tweeted on 19 December that he would be "more careful in future", which many branded a "nonapology".
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