Crossword Genius

River that is joined by the Foss in York (4)

Ross

I believe the answer is:

ouse

(Other definitions for ouse that I've seen before include "One of several rivers" , "Flowing water" , "English river, sounds as if it flows slowly" , "bird has lost its tail" , "O, Sue, here is a river" .)

I've seen this clue in The Times and The Sunday Times.
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