Punisher with fury about empty violence (7)
I believe the answer is:
avenger
'punisher' is the definition.
Both the definition and answer are singular nouns.
Perhaps you can see an association between them that I can't see?
'fury about empty violence' is the wordplay.
'fury' becomes 'anger' (fury is intense anger).
'about' is an insertion indicator.
'empty' means to remove the middle letters.
'violence' with its centre taken out is 've'.
'anger' going around 've' is 'AVENGER'.
'with' is the link.
Can you help me to learn more?
(Other definitions for avenger that I've seen before include "One who seeks or obtains satisfaction for injury" , "Bringer of retribution" , ""Nemesis"" , "one seeking to get even" , "one retaliating" .)