Felony (5)
'felony' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for crime that I've seen before include "Unlawful act" , "Murder, perhaps" , "Social problem" , "Punishable deed" , "Wrong" .)
'felony' is the definition.
(thesaurus)
This is all the clue.
(Other definitions for malfeasance that I've seen before include "illegal act" , "wrongful act" , "crime" , "Wrongdoing" .)