Way through Scots mountains becomes wider (8)

'becomes wider' is the definition.
I can't judge whether this definition defines the answer.

'way through scots mountains' is the wordplay.
'way' becomes 'road' (road is a kind of way).
'through' indicates putting letters inside (inserted letters go through the word).
'scots mountains' becomes 'bens' (as in Ben Nevis in Scotland. I am not sure about the 'scots' bit.).
'road' going into 'bens' is 'BROADENS'.

Can you help me to learn more?