Leather-piercing tool (3)
I believe the answer is:
awl
'leather-piercing tool' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for awl that I've seen before include "Tool for punching small holes" , "A boring thing" , "has its use at last" , "Shoemaker's tool" , "leather-workers use it" .)