Ban due to affect waterway (6)
I believe the answer is:
danube
'waterway' is the definition.
The definition and answer can be both natural objects as well as being singular nouns.
Maybe they are linked in a way I don't understand?
'ban due to affect' is the wordplay.
'to affect' indicates an anagram (I've seen 'affected' mean this).
'ban'+'due'='bandue'
'bandue' with letters rearranged gives 'DANUBE'.
Can you help me to learn more?
(Other definitions for danube that I've seen before include "Great European river, musically blue (6)" , "River in Europe" , "5 down's river" , "River flowing through Belgrade, Budapest and Vienna" , "Viennese river" .)