Seductress with anger — an evil character (7)
I believe the answer is:
vampire
'an evil character' is the definition.
(type of evil creature)
'seductress with anger' is the wordplay.
'seductress' becomes 'vamp' (I've seen this before).
'with' says to put letters next to each other.
'anger' becomes 'ire' (ire is intense rage).
'vamp'+'ire'='VAMPIRE'
(Other definitions for vampire that I've seen before include "It drinks the blood of the living by night" , "fabulous creature" , "Blood sucker" , "Bloodsucking creature" , "Legendary dead body that sucks blood" .)