Large container (3)
I believe the answer is:
vat
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">large container</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for vat that I've seen before include "Large tank for liquids, or kind of tax" , "Large tank or vessel" , "Large tub; tax" , "Barrel - tax" , "Fermentation vessel" .)