Worker could be up to tricks? (4)
I believe the answer is:
hand
'worker' 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 hand that I've seen before include "Hired worker" , "See 12" , "Worker - four inches - bunch of bananas" , "Cards dealt to player" , "Pointer; workman" .)