Something worn for a dance (6)
I believe the answer is:
bolero
'for a dance' is the definition.
(bolero is a kind of dance)
I cannot understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for bolero that I've seen before include "Famous Ravel work" , "Kind of jacket or dramatic music by Ravel" , "Spanish dance; Ravel's best-known work" , "Spanish dance and a type of jacket" , "Maurice Ravel's most famous work" .)