Brandy (3-2-3)
'brandy' is the definition.
(I know that brandy can be written as Eau-de-vie)
This is the entire clue.
'brandy' is the definition.
(Cognac is an example)
This is all the clue.
(Other definitions for cognac that I've seen before include "strong drink" , "High quality brandy" , "High-quality brandy" , "Brandy as for Napoleon (6)." , "warmer" .)