Role (4)
I believe the answer is:
part
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">role</span>' is the definition.<br/ ><span class="explanation-format__explanation">(eg a part or role in a film)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for part that I've seen before include "Portion of a whole" , "Some; break" , "Divide; role" , "Piece, segment" , "Region" .)