European/Asian river (4)

I believe the answer is:

ural

(Other definitions for ural that I've seen before include "River feeding Caspian Sea" , "Russian river flowing into the Caspian Sea" , "Mountain range between Europe and Asia" , "2,400 km river flowing through Russia and Kazakhstan into the Caspian Sea" , "River of central Russia" .)

I've seen this clue in the Newsday.

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