It's worn by a woman for a dance (6)

I believe the answer is:

bolero

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'for a dance' is the definition.
(bolero is a kind of dance)

I can't explain the remainder of the clue.

(Other definitions for bolero that I've seen before include "Dance -- work by 9" , "Maurice Ravel's most famous work" , "what Ravel wrote" , "Kind of jacket or dramatic music by Ravel" , "Upper garment or music piece by Ravel" .)

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

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