Referendum (4)
I believe the answer is:
poll
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">referendum</span>' is the definition.<br/ ><span class="explanation-format__explanation">(a referendum is a vote or poll)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for poll that I've seen before include "Votes cast at an election" , "straw, for example" , "one proverbially sick?" , "Vote; trim horns" , "head-count" .)