Crossword Genius

It grows down river in Germany (5)

Ross

I believe the answer is:

eider

I believe this is a double definition.

'it grows down' is the first definition.
(eider ducks grow down feathers)

'river in germany' is the second definition.
(Eider is a German river)

(Other definitions for eider that I've seen before include "Northern sea duck" , "Source of fine soft down" , "Duck noted for down" , "Duck from which down is obtained" , "Duck supplying down" .)

I've seen this clue in The Times.
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