Angers as genre varies (7)
I believe the answer is:
enrages
'angers' is the definition.
(enraging is a kind of angering)
'as genre varies' is the wordplay.
'varies' is an anagram indicator.
'as'+'genre'='asgenre'
'asgenre' with letters rearranged gives 'ENRAGES'.
(Other definitions for enrages that I've seen before include "Makes violently angry" , "Infuriates" , "Makes furious" , "Incenses" , "As green changes it makes one angry" .)