Small part (8)
I believe the answer is:
fraction
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">small part</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 fraction that I've seen before include "Fragment" , "Inca fort (anag)" , "little bit" , "Number of mathematicians" , "may be improper" .)