Portion of a larger whole (7)
I believe the answer is:
aliquot
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">portion of a larger 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 aliquot that I've seen before include "giving exact division" , "Integral factor" , "Chemical sample" , "Portion of a larger whole; to quail (anagram)" , "Of divisor producing quotient without fraction." .)