Fellows cowboys have a use for (5)

I believe the answer is:

chaps

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'fellows' is the definition.
(chap can mean a man)

I don't understand the rest of the clue.

(Other definitions for chaps that I've seen before include "Men; leather trousers" , "providing leather bags from US" , "Cowboy leggings" , "Blokes" , "Cowboy's trousers; men" .)

I've seen this clue in the Evening Standard.

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