Oats from Western Samoa for boxers, for instance

I believe the answer is:

menswear

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'instance' is the definition.
Both the definition and answer are singular nouns.
Maybe you can see a link between them that I can't see?

I don't understand how the remainder of the clue works.

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(Other definitions for menswear that I've seen before include "Male clothes" , "Male attire" , "Male outfits" , "Clothing for males" , "clobber" .)

I've seen this clue in the Irish Times.

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