John of Monty Python (6)
I believe the answer is:
cleese
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">john of monty python</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for cleese that I've seen before include "John --, English comedian and actor" , "English comic actor and writer, b. 1939" , "John --, Python comic" , "Monty Python actor" , "John - (Fawlty Towers)" .)