Crossword Genius

Europe's second-longest river (6)

Ross

I believe the answer is:

danube

'europe's second-longest river' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for danube that I've seen before include "flower" , "Vienna's river" , "It's blue according to the song" , "Central European river" , "River flowing through Belgrade, Budapest and Vienna" .)

I've seen this clue in The New York Times and the USA Today.
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