Ban due to river (6)

I believe the answer is:

danube

I'm a little stuck... Click here to teach me more about this clue!

'to river' is the definition.
(Danube River is an example)

'ban due' is the wordplay.
'ban due' anagrams to 'DANUBE'.
Though, I'm not sure how this is indicated.

Can you help me to learn more?

(Other definitions for danube that I've seen before include "Ban due (anag) - river" , "Central European river" , "South European river" , "It's blue according to the song" , "Europe's musically blue river" .)

I've seen this clue in The Irish Independent.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.