Use a needle (6)
'use a needle' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for stitch that I've seen before include "result of working with needle?" , "Sharp spasm of pain in the side" , "Loop of thread" , "Pain caused by running" , "Something surgeon provides" .)
(Other definitions for darn that I've seen before include "Mend by stitching - damn!" , "Mend (e.g. socks)" , "Sew" , "Mend with a needle" , "Repair by sewing, socks perhaps" .)
'use a needle' is the definition.
(you use a needle when sewing)
This is the entire clue.
(Other definitions for sew that I've seen before include "Fasten with stitches" , "Make stitches" , "Work with needle and thread" , "Tack" , "Stitch with needle and thread" .)