Is this river in some way mountainous? (4)
I believe the answer is:
ural
'is this river' is the definition.
'Ural' can be an answer for 'river' (Russian river). I'm unsure of the rest of the definition.
'some way mountainous?' is the wordplay.
'some' says to take the centre.
'way' becomes 'route' (route is a kind of way).
'mountainous?' becomes 'ral' (I can't justify this - if you can you should give a lot more credence to this answer).
The centre of 'route' is 'u'.
'u'+'ral'='URAL'
'in' is the 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" .)