Bridal accessory (4)
I believe the answer is:
veil
'bridal accessory' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for veil that I've seen before include "Cover, conceal" , "Curtain, disguise" , "Yashmak, for instance" , "Yashmak, e.g." , "Conceal, screen" .)