A white wine (8)
(Other definitions for riesling that I've seen before include "Dry white wine (German)" , "Aromatic white wine from the Rhine valley" , "Sir Ingle makes wine from this grape" , "Gin riles the wine" , "Fragrant white wine from the Rhine valley or from California" .)
(Other definitions for semillon that I've seen before include "Wine grape" , "alcoholic drink" .)