Copy-machine supply (5)
I believe the answer is:
toner
'copy-machine supply' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for toner that I've seen before include "Skin improver" , "Chemical solution used to soften colours" , "Astringent liquid (to improve skin)" , "Lotion for cleansing the skin" , "Copier powder" .)