Eyelash application (7)
I believe the answer is:
mascara
'eyelash application' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for mascara that I've seen before include "black application" , "Eyelash cosmetic" , "for application of lashes" , "Cosmetic for darkening the eyelashes" , "could be found in handbag, perhaps" .)