Sibyl is confused about article for North Africans (7)
I believe the answer is:
libyans
'africans' is the definition.
(Libyan is an example)
'sibyl is confused about article for north' is the wordplay.
'is confused' is an anagram indicator.
'about' is an insertion indicator.
'article' becomes 'a' (the indefinite article in English).
'for' says to put letters next to each other.
'north' becomes 'n' (abbreviation).
'sibyl' with letters rearranged gives 'libys'.
'a'+'n'='an'
'libys' enclosing 'an' is 'LIBYANS'.
(Another definition for libyans that I've seen is " Africans".)