Corrupt African oil state (10)
I believe the answer is:
california
'state' is the definition.
(I know that California is a American state)
'corrupt african oil' is the wordplay.
'corrupt' is an anagram indicator.
'african'+'oil'='africanoil'
'africanoil' anagrammed gives 'CALIFORNIA'.
(Other definitions for california that I've seen before include "US state" , "The Golden State" .)