Part of a whole (7)
I believe the answer is:
portion
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">part of a whole</span>' is the definition.<br/ ><span class="explanation-format__explanation">('portion' is part of 'whole')</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for portion that I've seen before include "Piece of a whole" , "Amount of food" , "allotment" , "Part of a whole" , "Helping - fate" .)