It’s an inaccurate epithet anyhow. Uncle Tom was overly nice to whites so as not to draw their wrath.
In the end, the whites beat Uncle Tom to death when he refused to give the whereabouts of two runaway slaves.
I don’t know what epithet you’d call someone who turned in the two slaves and lived to work the big house another day, but that’s what you should call Clarence.
I used to call Clarence an Uncle Tom, but then I read the book.