Bordeaux grape (6)
I believe the answer is:
merlot
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">bordeaux grape</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for merlot that I've seen before include "Black grape variety" , "Grape makes elm rot" , "Wine made from bad elm rot" , "Black wine grape" , "Kind of wine grape" .)