Spanish fortified wine (6)
'spanish fortified wine' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for sherry that I've seen before include "Preprandial drink" , "Oloroso or amontillado?" , "booze" , "Alcoholic drink" , "Jerez drink" .)
(Other definitions for oloroso that I've seen before include "Golden sherry" , "Albert -, missionary, musician, philosopher" , "Dark, sweet sherry" , "Heavy dark sherry" , "Drink" .)