Sew loosely (5)
I believe the answer is:
baste
'sew loosely' is the definition.
(synonyms)
This is the entire clue.
(Other definitions for baste that I've seen before include "Pour fat over meat during cooking" , "Keep moisturised when baking" , "Moisten with liquid fat while roasting" , "clobber" , "Tack with long, loose stitches" .)