Crossword Genius

Manual workers describing case for historians? (5)

Ross

I believe the answer is:

hands

'manual workers' is the definition.
(eg factory hands)

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

(Other definitions for hands that I've seen before include "Players' cards" , "Crew members" , "Those holding harness" , "Cards given out in deal" , "Passes" .)

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