Glug (4)
I believe the answer is:
swig
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">glug</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for swig that I've seen before include "Drink in large draughts" , "Drink quickly from bottle" , "Glug" , "Drink (a deep draught)" , "Large draught of drink" .)