River with waterfowl and some geese (6)

I believe the answer is:

swanee

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'river' is the definition.
Both the answer and definition are singular nouns.
Perhaps there's a link between them I don't understand?

'waterfowl and some geese' is the wordplay.
'waterfowl' becomes 'swan' (I've seen this in another clue).
'and' says to put letters next to each other.
'some geese' becomes 'ee' (I can't explain this - if you can you should believe this answer much more).
'swan'+'ee'='SWANEE'

'with' acts as a link.

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