Sherry glass (8)
I believe the answer is:
schooner
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">sherry glass</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 schooner that I've seen before include "Type of glass" , "Old sailing ship and tall sherry glass" , "Measure for sherry or kind of sailing ship" , "Large beer or sherry glass" , "A measure or glass for sherry" .)