Aggressive Conservative club in bad movie (9)
I believe the answer is:
combative
'aggressive' is the definition.
(similar in meaning)
'conservative club in bad movie' is the wordplay.
'conservative' becomes 'C' (UK political abbreviation).
'club' becomes 'bat' (as in sporting equipment).
'in' indicates putting letters inside.
'bad' indicates an anagram.
'movie' anagrammed gives 'omive'.
'bat' put inside 'omive' is 'ombative'.
'c'+'ombative'='COMBATIVE'
(Other definitions for combative that I've seen before include "Eager to fight, aggressive" , "Pugnacious" .)