Crossword Genius

River duck with a red back (4)

Ross

I believe the answer is:

oder

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

'duck with a red back' is the wordplay.
'duck' becomes 'o' (resembles zero - 'duck' in cricket).
'with' says to put letters next to each other.
'back' is a reversal indicator.
'red' back-to-front is 'der'.
'o'+'der'='ODER'

(Other definitions for oder that I've seen before include "School blazer insignia" , "European flower" , "River forming northern part of the German-Polish border" , "River flowing into the Baltic" , "Rode around the European river" .)

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