Color changer (4)
I believe the answer is:
dyer
'color changer' 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 "Adder of colour" , "Colourer of fabrics" , "Changer of colour" , "One colouring cloth" , "Cloth worker" .)