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They won't go off clothes of a retro style (4)

Ross

I believe the answer is:

duds

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'style' is the definition.
(thesaurus)

I don't understand the rest of the clue.

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(Other definitions for duds that I've seen before include "Failures; clothes" , "Bombs that fail to explode" , "One assumes them" .)

I've seen this clue in The Sunday Times and The Times.
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