Choose not to vote (7)
I believe the answer is:
abstain
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">choose not to vote</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for abstain that I've seen before include "Pass" , "decline at voting time" , "Resist" , "Go without" , "Don't drink" .)