Stitched fold (4)
I believe the answer is:
tuck
'stitched fold' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for tuck that I've seen before include "Food (colloq)" , "Schoolboy grub like sweets and cakes" , "Friar friend of Robin Hood - to gather - food" , "Pleat in garment" , "Cosmetic procedure" .)