Crossword Genius

Ramble in a sound country capital (4)

Ross

I believe the answer is:

roam

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

'ramble' is the definition.
(I know that ramble can be written as roam)

'a sound country capital' is the wordplay.
I cannot quite see how this works, but
'a' is present in the answer.
The remaining letters 'rom' is a valid word which might be clued in a way I don't understand.
This may be the basis of the clue (or it may be nonsense).

'in' acts as a link.

Can you help me to learn more?

(Other definitions for roam that I've seen before include "Ramble without purpose" , "Wander freely" , "Wander widely" , "Peregrinate" , "Move about aimlessly" .)

I've seen this clue in the Sydney Morning Herald.
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