Who may get drunk with real relish, misbehaving (10)
I believe the answer is:
hellraiser
'who may get drunk' is the definition.
(hellraiser can mean a violent, drunken person)
'with real relish misbehaving' is the wordplay.
'with' is a charade indicator (letters next to each other).
'misbehaving' indicates anagramming the letters.
'real' put next to 'relish' is 'realrelish'.
'realrelish' is an anagram of 'HELLRAISER'.
(Other definitions for hellraiser that I've seen before include "Wild character" , "He approaches" , "Loud, violent, often drunken troublemaker" .)