Half or third? (8)
I believe the answer is:
fraction
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">half or third?</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I know that half is a type of common fraction)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for fraction that I've seen before include "A division of a whole number" , "Small proportion" , "Proportional" , "Part of an integer" , "Not a whole number - it's smaller" .)