Fabric worker (4)
I believe the answer is:
dyer
'fabric worker' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for dyer that I've seen before include "Drey (anag.)" , "One colouring e.g. fabric" , "I change colour" , "Increase (in output)" , "Cloth worker" .)