The limitations of hopeless workers (5)
I believe the answer is:
hands
'workers' is the definition.
(hand is a kind of worker)
I can't explain the rest of the clue.
Can you help me to learn more?
(Other definitions for hands that I've seen before include "Measurements for horses" , "skill in handling reins" , "Body parts; crewmen" , "Workers" , "Units for measuring horse's height" .)