Sharp parts of saws (5)
I believe the answer is:
teeth
'sharp parts of saws' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for teeth that I've seen before include "Cogwheel projections" , "Incisors, say" , "Eg, canines, incisors" , "genuine power" , "rarely a hen's" .)