Bordeaux's fine wine (4)
I believe the answer is:
cava
I believe this clue is a double definition.
'bordeaux's fine' is the first definition.
('ca va' can mean 'fine' in French eg in Bordeaux)
'wine' is the second definition.
(I have seen 'Spanish wine ' mean 'cava' so perhaps 'wine' could also mean 'cava')
(Other definitions for cava that I've seen before include "Spanish "champagne"" , "Sparkler" , "Spanish sparkling white wine" , "Spanish fizz" , "Spanish sparking wine" .)