Colorful part of the eye (4)
I believe the answer is:
iris
'colorful part of the eye' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for iris that I've seen before include "Eye part or pretty flower" , "Flag,flower and part of the eye" , "Greek goddess of the rainbow" , "who keeps pupil in?" , "Film about writer _______ Murdoch" .)