Sharp pain produced by a needle (6)
I believe the answer is:
stitch
I believe this clue is a double definition.
'sharp pain' is the first definition.
(I've seen this before)
'a needle' is the second definition.
(thesaurus)
'produced by' acts as a link.
(Other definitions for stitch that I've seen before include "Pain for runner" , "A result of running" , "Piece of needlework" , "repair" , "One in time saves nine" .)