Crossword Genius

Is this river in some way mountainous? (4)

Ross

I believe the answer is:

ural

I'm a little stuck... Click here to teach me more about this clue!

'is this river' is the definition.
'ural' can be an answer for 'river' (I've seen this before). I am not certain of the rest of the definition.

'some way mountainous?' is the wordplay.
I cannot really understand how this works, but
'some' could be 'a' and 'a' is found in the answer.
The remaining letters 'url' is a valid word which might be clued in a way I don't see.
This may be the basis of clue (or it may be nonsense).

'in' acts as a link.

Can you help me to learn more?

(Other definitions for ural that I've seen before include "Russian river giving name to mountain range" , "The - mountains separate Asia and Europe" , "Europe/Asia river" , "Russian river giving name to mountains" , "Mountain range between Europe and Asia" .)

I've seen this clue in the Evening Standard.
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