John —, actor who played the title role in ITV series Inspector Morse (4)

I believe the answer is:

thaw

(Other definitions for thaw that I've seen before include "John, once regularly on TV" , "(Of snow) start to melt" , "As Lewis's boss, you'll have seen me" , "detente" , "Become more friendly" .)

I've seen this clue in The Mirror.

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