The workers appear restless (5)
I believe the answer is:
shift
'the workers' 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 shift that I've seen before include "Garment -- period of work" , "Dislodge" , "Change - period of work" , "Move from one position to another" , "Alter" .)