Mascara recipient (4)
'mascara recipient' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for lash that I've seen before include "Fasten with rope; whip" , "Whip or scourge" , "Birch" , "Flexible strip of a whip" , "Strike with a whip" .)
(Other definitions for eyelash that I've seen before include "Short facial hair" , "Facial hair, cilium" , "Hairs on lid edge" , "maybe one drops with a wink" , "hair near Iris" .)