Red wine grape (6)
'red wine grape' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for merlot that I've seen before include "Wine-producing black grape" , "Grape makes elm rot" , "Black wine grape" , "Red wine grape variety" , "Kind of wine grape" .)
(Other definitions for syrah that I've seen before include "Dark-skinned red wine grape" , "Grape variety (Shiraz)" , "Black grape variety" , "Red grape variety" .)