Cosmetic lotion printer may need (5)
I believe the answer is:
toner
'cosmetic' is the definition.
(I've seen this in another clue)
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for toner that I've seen before include "Material for printer" , "Skin-cleansing lotion" , "Skin improver" , "Black or coloured powder used in a printer" , "Lotion for cleansing the skin" .)