Medium-sweet sherry (7)
I believe the answer is:
oloroso
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">medium-sweet sherry</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 oloroso that I've seen before include "wine" , "Dark type of sherry" , "Heavy dark sherry" , "Dark, sweet sherry" , "Drink" .)