Part, portion (5)
I believe the answer is:
piece
<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">(I know that part can be written as piece)</span><br/ ><br/ >'<span class="explanation-format__original">portion</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(I know that piece is a type of portion)</span><br/ ><br/ ></span>
(Other definitions for piece that I've seen before include "Component; portion" , "Part - portion" , "king or queen?" , "man on board" , "that may follow show after work party?" .)