Eye coverer (3)
I believe the answer is:
lid
'eye coverer' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for lid that I've seen before include "Kind of cover, may be hinged" , "Movable cover" , "Pie crust; cover" , "Hinged or removable cover as for bottle" , "Removable cover of a container" .)