Organs of vision (4)
I believe the answer is:
eyes
'organs of vision' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for eyes that I've seen before include "Blemishes on potatoes" , "(Paradoxical?) film with Cruise and Kidman" , "Closely looks at" , "Optical organs" , "Poetically, they're the windows of the soul" .)