River ban due to be arranged (6)
I believe the answer is:
danube
'river' is the definition.
(Danube is an example)
'ban due to be arranged' is the wordplay.
'to be arranged' indicates anagramming the letters.
'ban'+'due'='bandue'
'bandue' is an anagram of 'DANUBE'.
(Other definitions for danube that I've seen before include "River flowing from Black Forest to Black Sea" , "Central European river" , "Ban due (anag) - river" , "Viennese river" , "Major European river" .)