John —, comic actor who co-wrote and starred in BBC TV sitcom Fawlty Towers (6)

I believe the answer is:

cleese

(Other definitions for cleese that I've seen before include "John --, English comedian and actor" , "John - (Fawlty Towers)" , "John --, Python comic" , "John --, British comedian" , "Monty Python actor" .)

I've seen this clue in The Mirror.

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