"Blinkers" or "peepers" (4)
I believe the answer is:
eyes
I believe this is a double definition.
'blinkers' is the first definition.
(I've seen this in another clue)
'peepers' is the second definition.
('eye' can be a synonym of 'peeper')
(Other definitions for eyes that I've seen before include "They have pupils" , "private detectives" , "Optical organs" , "Storm centres" , "Narrowly watches" .)