City in South Africa in fine area (5)
I believe the answer is:
osaka
'city' is the definition.
(Osaka is an example)
'south africa in fine area' is the wordplay.
'south africa' becomes 'sa' (abbreviation).
'in' means one lot of letters goes inside another.
'fine' becomes 'ok' ('OK' can be a synonym of 'fine').
'area' becomes 'a' (maths abbreviation).
'sa' put inside 'ok' is 'osak'.
'osak'+'a'='OSAKA'
'in' is the link.
(Other definitions for osaka that I've seen before include "Japanese city near Kobe" , "Third most populous Japanese city" , "Large city and port in Japan" , "Kinki's capital" , "Japanese port, Bay" .)