Fresh water, but it's said to have a smell (4)

I believe the answer is:

oder

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'fresh water' is the definition.
'Oder' can be an answer for 'water' (Oder is an example). I am not certain of the 'fresh' bit.

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for oder that I've seen before include "waterway" , "German banker" , "East European river" , "River flowing into the Baltic" , "River on border of Poland and Germany" .)

I've seen this clue in the Evening Standard.

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