John of "Monty Python" fame (6)
I believe the answer is:
cleese
'john of monty python fame' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for cleese that I've seen before include "John --, British comedian" , "English comic actor and writer, b. 1939" , "John - (Fawlty Towers)" , "John --, Python comic" , "John --, English comedian and actor" .)