Windshield feature (4)
I believe the answer is:
tint
'windshield feature' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for tint that I've seen before include "Hue, shade" , "'Shade, tone (4)'" , "Hair dye" , "work for coiffeuse?" , "A slighth shade of colour" .)