Smelly-sounding river (4)

I believe the answer is:

oder

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'river' is the definition.
(River Oder in central Europe)

I cannot understand how the rest of the clue works.

(Other definitions for oder that I've seen before include "River on border of Poland and Germany" , "European flower" , "Rode around the European river" , "River that, with the Neisse, forms the German-Polish border" , "German river that empties into the Baltic Sea" .)

I've seen this clue in The Telegraph.

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