Crossword Genius

River (a converted sewer?) (5)

Ross

I believe the answer is:

weser

'river' is the definition.
(German river)

'a converted sewer?' is the wordplay.
'a converted' indicates anagramming the letters.
'sewer' anagrammed gives 'WESER'.

(Other definitions for weser that I've seen before include "Er, sew up the German river" , "German runner" .)

I've seen this clue in the Evening Standard.
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