Cut to fit (4)
I believe the answer is:
trim
'cut to fit' 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 "Reduce slightly" , "Cut, prune; decorate" , "Cut off excess, make neat" , "Cut off; in good order" , "Arrange sails to suit the weather" .)