Take another course in sewing (4)
I believe the answer is:
tack
'sewing' is the definition.
(thesaurus)
I don't understand the remainder of the clue.
Can you help me to learn more?
(Other definitions for tack that I've seen before include "Nail; course of action" , "Nail for carpet?" , "Nail - windward course - temporary stitch" , "fix > riding gear" , "Poor food" .)