Even bits of this would do for workers (5)
I believe the answer is:
hands
'workers' is the definition.
(hand is a kind of worker)
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for hands that I've seen before include "Workmen" , "Those holding harness" , "Units for measuring horse's height" , "Measurements for horses" , "Workers" .)