She goes to Rio in South America (4)

I believe the answer is:

rosa

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'she' is the definition.

'rio in south america' is the wordplay.
'rio in' becomes 'ro' (I can't explain this - if you can you should believe this answer much more).
'south america' becomes 'SA' (abbreviation).
'ro'+'sa'='ROSA'

'goes to' acts as a link.

Can you help me to learn more?

(Other definitions for rosa that I've seen before include "Parks" , "Sub .... - in confidence" .)

I've seen this clue in the Evening Standard.

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