Marx's drunken utterance inspired by leading pair of Communists (5)
I believe the answer is:
chico
'marx's' is the definition.
(chico marx was a marx brother)
'drunken utterance inspired by leading pair of communists' is the wordplay.
I cannot really see how this works, but
'of' could be 'o' and 'o' is found in the answer.
'drunken utterance' could be 'hic' (I've seen this in another clue) and 'hic' is located in the answer.
A single letter 'c' remains which might be clued in a way I don't see.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for chico that I've seen before include "One of Groucho's brother" , "Eldest of the Marx Brothers" , "A Marx brother" , "One of the Marx Brothers" .)