Scotsman outside wicked African city (6)
I believe the answer is:
ibadan
'african city' is the definition.
(I've seen this before)
'scotsman outside wicked' is the wordplay.
'scotsman' becomes 'ian'.
'outside' is an insertion indicator.
'wicked' becomes 'bad' ('bad' can be similar in meaning to 'wicked').
'ian' placed around 'bad' is 'IBADAN'.
(Other definitions for ibadan that I've seen before include "in West Africa" , "Nigerian city; ban aid (anag.)" , "African city" , "Capital of Oyo state, Nigeria" .)