Crush repulsive revolutionary (9)
I believe the answer is:
pulverise
'crush' is the definition.
('crush'->'pulverize' is in my internal thesaurus and 'ize'->'ise')
'repulsive revolutionary' is the wordplay.
'revolutionary' is an anagram indicator.
'repulsive' is an anagram of 'PULVERISE'.
(Other definitions for pulverise that I've seen before include "Repulsive (anag.)" , "Reduce to dust (S, not Z)" , "Grind to powder" , "defeat" , "Crush thoroughly in repulsive manner" .)