An oribi let loose in African city (7)
I believe the answer is:
nairobi
'african city' is the definition.
(capital of Kenya)
'an oribi let loose' is the wordplay.
'let loose' indicates anagramming the letters.
'an'+'oribi'='anoribi'
'anoribi' anagrammed gives 'NAIROBI'.
'in' is the link.
(Other definitions for nairobi that I've seen before include "I, a robin (anag) - city" , "East African capital" , "Flat round object" , "Foreign capital" , "The capital of Kenya (7)" .)