Flower; part of the eye (4)
I believe the answer is:
iris
<span class="explanation-format__ClueExplanation">I believe this clue is a triple definition!<br/ ><br/ >'<span class="explanation-format__original">flower</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >'<span class="explanation-format__original">part</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(iris is a kind of part)</span><br/ ><br/ >'<span class="explanation-format__original">of</span>' acts as a link.<br/ ><br/ >'<span class="explanation-format__original">the eye</span>' is the third definition.<br/ ><span class="explanation-format__explanation">(thesaurus)</span><br/ ><br/ ></span>
(Other definitions for iris that I've seen before include "Rainbow - flag" , "Eye part or pretty flower" , "Flag - part of eye" , "plant with showy flowers" , "Garden flower - part of eye" .)