Colored part of the eye (4)
I believe the answer is:
iris
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">colored part of the eye</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(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?" .)