Visor (8)
I believe the answer is:
eyeshade
'visor' is the definition.
(I know that eyeshade is a type of visor)
This is all the clue.
(Other definitions for eyeshade that I've seen before include "Visor to protect from strong light" , "Translucent visor" , "Sun visor" , "something like CAP" , "Visor worn by card-players" .)