Sewing instrument (6)
I believe the answer is:
needle
'sewing instrument' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for needle that I've seen before include "Leaf of a 15 across" , "sledge?" , "narrow-eyed one" , "Sewing implement used to annoy" , "Stiff leaf of a conifer" .)