Face cover (4)
(Other definitions for visor that I've seen before include "Sunscreen" , "Anti-glare flap over the windscreen" , "Face-armour" , "Movable front part of helmet" , "Face armour" .)
'face cover' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for mask that I've seen before include "False face" , "Camouflage" , "One hiding, protecting face" , "Screen" , "Cover for the face" .)