Barber's sharpener (5)
I believe the answer is:
strop
'barber's sharpener' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for strop that I've seen before include "Razor-sharpener" , "Display of temper" , "Razor sharpener" , "Prime cutthroat" , "fit of anger" .)