Choose not to do something (7)
I believe the answer is:
abstain
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">choose not to do something</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for abstain that I've seen before include "Resist" , "Do without, as in lent" , "Refrain (from drink)" , "Forego,do without" , "Formally decline to vote" .)