Colored part of the eye (4)
I believe the answer is:
iris
'colored part of the eye' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for iris that I've seen before include "pupil's governor" , "Lily" , "Plant - part of the eye" , "Flag,flower and part of the eye" , "who keeps pupil in?" .)