Part, piece (3)
I believe the answer is:
bit
<span class="explanation-format__ClueExplanation">I believe this clue is a double definition.<br/ ><br/ >'<span class="explanation-format__original">part</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(both mean a piece of something)</span><br/ ><br/ >'<span class="explanation-format__original">piece</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(bit is a kind of piece)</span><br/ ><br/ ></span>
(Other definitions for bit that I've seen before include "Small portion - part of drill" , "Boring tip of a drill" , "Snaffle - small piece" , "Took effect - fragment" , "Morsel" .)