Barbershop request (4)
I believe the answer is:
trim
'barbershop request' 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 "Cut away; decorate" , "Pare; in good order" , "Cut off; slim and fit" , "Neat and tidy as a town in Meath" , "Cut away protruding bits, say of hair" .)