Two rivers in a Scots mountain city (8)
I believe the answer is:
aberdeen
'city' is the definition.
(Aberdeen is an example)
'two rivers in a scots mountain' is the wordplay.
'two rivers' means two substitutions for 'river'.
'river' becomes 'r' (abbreviation for river).
'river' becomes 'dee' (River Dee).
'in' means one lot of letters goes inside another.
'scots mountain' becomes 'ben' (eg Ben Nevis).
'r'+'dee'='rdee'
'a'+'ben'='aben'
'rdee' going within 'aben' is 'ABERDEEN'.
(Other definitions for aberdeen that I've seen before include "somewhere in Scotland" , "Scottish university" , "5,27 [PRIME MINISTER]" , "Victorian premier" , "Granite City of Scotland" .)