Being part of a whole (11)
I believe the answer is:
constituent
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">being part of a whole</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for constituent that I've seen before include "Being part of a whole" , "Component part" , "Integral" , "local elector" , "voter" .)