Perpetrator of a dark deed (7)
I believe the answer is:
burglar
'perpetrator of a dark deed' is the definition.
The definition and answer can be both people as well as being singular nouns.
Maybe there's an association between them I don't understand?
This is the entire clue.
Can you help me to learn more?
(Other definitions for burglar that I've seen before include "Thief (entering building)" , "One enters a building in order to steal" , "One breaking in" , "House robber" , "He takes" .)