Yankee almost upset North African (6)
I believe the answer is:
kenyan
'african' is the definition.
(Kenyan is an example)
'yankee almost upset north' is the wordplay.
'almost' means to remove the last letter (most of the word but not all of it).
'upset' is an anagram indicator.
'north' becomes 'n' ('N' can be a synonym of 'north').
'yankee' with its final letter taken away is 'yanke'.
'yanke' is an anagram of 'kenya'.
'kenya'+'n'='KENYAN'
(Other definitions for kenyan that I've seen before include "Nationality of native of Nairobi" , "Native of Nairobi, perhaps" , "Nationality of citizen of Nairobi" , "Person from Nairobi, say" , "From Mombasa, for example" .)