City airline crossing from South African country (6)
I believe the answer is:
bogota
'city' is the definition.
(Bogota is an example)
'airline crossing from south african country' is the wordplay.
'airline' becomes 'BA' (British Airways).
'crossing' means one lot of letters goes inside another.
'from south' says the letters should be written in reverse.
'african country' becomes 'togo' (country in Africa).
'togo' reversed gives 'ogot'.
'ba' enclosing 'ogot' is 'BOGOTA'.
(Other definitions for bogota that I've seen before include "Colombian capital" , "Andean city" , "Capital city of Colombia" , "South American city" , "Submissive" .)