Awfully repulsive crush (9)
I believe the answer is:
pulverise
'crush' is the definition.
('crush'->'pulverize' is in my internal thesaurus and 'ize'->'ise')
'awfully repulsive' is the wordplay.
'awfully' indicates an anagram.
'repulsive' with letters rearranged gives 'PULVERISE'.
(Other definitions for pulverise that I've seen before include "Grind to powder" , "Repulsive (anag.)" , "Beat to a pulp" , "Reduce to dust (S, not Z)" , "Crush thoroughly in a repulsive way" .)