Very much dislike mania to be different (9)
I believe the answer is:
abominate
'very much dislike' is the definition.
(I know that to abominate is to a good deal dislike)
'mania to be different' is the wordplay.
'different' is an anagram indicator (letters placed in a different order).
'mania'+'to'+'be'='maniatobe'
'maniatobe' is an anagram of 'ABOMINATE'.
(Other definitions for abominate that I've seen before include "Amoeba nit - easy to loathe" , "Condemn" , "Be revolted by" , "Loathe, detest" , "Dislike deeply" .)