Copier chemical (5)
I believe the answer is:
toner
'copier chemical' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for toner that I've seen before include "Lotion for cleansing the skin" , "Material for printer" , "Chemical solution used to soften colours" , "Powder used in printers" , "Skin improver" .)