Beaune, not the ultimate in wine, drunk with date and flowing water (6)
I believe the answer is:
danube
'water' is the definition.
(Danube is an example)
I don't understand the remainder of the clue.
Can you help me to learn more?
(Other definitions for danube that I've seen before include "South European river" , "River flowing from Black Forest to Black Sea" , "Viennese river" , "It's blue according to the song" , "River flowing through Belgrade, Budapest and Vienna" .)