Wandering; doing wrong (6)
I believe the answer is:
errant
I believe this clue is a double definition.
'wandering' is the first definition.
(I've seen this in another clue)
'doing wrong' is the second definition.
(I've seen this before)
(Other definitions for errant that I've seen before include "Rambling" , "Wrong" , "Kind of knight who once travelled for adventure" , "Offending" , "Behaving badly" .)