Crossword Genius

Works hard in jumpers without hesitation (6)

Ross

I believe the answer is:

sweats

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'works hard' is the definition.
(I've seen this before)

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

Can you help me to learn more?

(Other definitions for sweats that I've seen before include "Works hard" , "old soldiers" , "Perspires" , "Casual dress" , "Clothes" .)

I've seen this clue in The Mirror.
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