Sommelier's serving (4)
I believe the answer is:
wine
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">sommelier's serving</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 wine that I've seen before include "Chianti or Chardonnay?" , "Rich red" , "Alcoholic grape juice" , "champagne, perhaps" , "Red, white or rose?" .)