In stitches (4)
I believe the answer is:
sewn
'in stitches' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for sewn that I've seen before include "Fastened with thread" , "Fastened with needlework" , "What's embroidered" , "done with a needle" , "Run up" .)