Stoppered glass container (8)
I believe the answer is:
decanter
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">stoppered glass container</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 decanter that I've seen before include "Wine/spirits container" , "quantity of wine?" , "glass full of drink" , "receptacle for wine" , "Stoppered wine bottle" .)