Take another course in sewing (4)

I believe the answer is:

tack

I'm a little stuck... Click here to teach me more about this clue!

'sewing' is the definition.
(thesaurus)

I don't understand the remainder of the clue.

(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" .)

I've seen this clue in The Telegraph, The Globe and Mail and The Guardian.

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