Tool order Charlie has left for workers (10)
I believe the answer is:
instrument
'tool' is the definition.
(I know that tool can be written as instrument)
'order charlie has left for workers' is the wordplay.
I cannot really see how this works, but
'workers' could be 'men' (men can mean staff or employees) and 'men' is found within the answer.
This explanation may well be incorrect...
(Other definitions for instrument that I've seen before include "Joanna, perhaps" , "power" , "What's needed for 1 [MUSICIAN]" , "legal document" , "Word puzzle" .)