Miscreant (5)
I believe the answer is:
rogue
'miscreant' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for rogue that I've seen before include "Dishonest chap; solitary (elephant)" , "one behaving atypically" , "Miscreant" , "Prankster" , "Stray" .)