Make-up item (8)
(Other definitions for cosmetic that I've seen before include "Superficial - lipstick, say" , "Beauty improver" , "Facial preparation" , "Preparation designed to beautify the body" , "With surface effect only" .)
This clue is a double definition.
'make-up' is the first definition.
(I've seen this before)
'item' is the second definition.
(I have seen 'Item of 25dn ' mean 'eyeliner' so perhaps 'item' could also mean 'eyeliner')
(Other definitions for eyeliner that I've seen before include "it draws attention to the viewer" , "Facial cosmetic" , "instrument for enhancing lamps" , "highlight for look-out" , "Make-up item" .)