Habitual drunkard (3)
I believe the answer is:
sot
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">habitual drunkard</span>' is the definition.<br/ ><span class="explanation-format__explanation">(sot can mean a drunken person)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for sot that I've seen before include "One drinks" , "One's often intoxicated" , "Habitual drunkard" , "A chronic drinker" , "Toper" .)