Printer powder (5)
I believe the answer is:
toner
'printer powder' 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 "Copier powder" , "Skin improver" , "Powdered pigment used in laser printers" , "Powder used in printers" , "Astringent liquid (to improve skin)" .)