Cut back a bit (4)
I believe the answer is:
trim
'cut back a bit' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for trim that I've seen before include "Pare; in good order" , "Neat - crop" , "Neat - prune" , "(Make) neat and tidy" , "Additional decoration, in good order" .)