Abstainer (11)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">abstainer</span>' is the definition.<br/ ><span class="explanation-format__explanation">(teetotaller is a kind of abstainer)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for teetotaller that I've seen before include "no supper!" , "Non-drinker" , "Rechabite" , "as observant Muslim, say" , "One dry" .)