Look after troublemaker creating damage (6)
I believe the answer is:
impair
'damage' is the definition.
(impairing is a kind of damaging)
'look after troublemaker' is the wordplay.
'look' becomes 'air' (I've seen this before).
'after' is a charade indicator (letters next to each other).
'troublemaker' becomes 'imp' (I've seen this before).
'air' put after 'imp' is 'IMPAIR'.
'creating' acts as a link.
(Other definitions for impair that I've seen before include "Damage or handicap" , "'Mar, spoil (6)'" , "Reduce" , "Hobble" , "blunt" .)