Rob hung jeans out in African city (12)
I believe the answer is:
johannesburg
'african city' is the definition.
(I've seen this before)
'rob hung jeans out' is the wordplay.
'out' indicates anagramming the letters (out can mean wrong or inaccurate).
'rob'+'hung'+'jeans'='robhungjeans'
'robhungjeans' anagrammed gives 'JOHANNESBURG'.
'in' is the link.
(Other definitions for johannesburg that I've seen before include "South African city" , "Largest S. African city" .)