It has a cutting edge (5)
I believe the answer is:
blade
'it has a cutting edge' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for blade that I've seen before include "cutter" , "Runner on an ice-skate" , "Leaf, of grass, say" , "Young chap, dashing" , "Flat part of an oar" .)