African knowledge backing denial (6)
I believe the answer is:
kenyan
'african' is the definition.
(Kenyan is an example)
'knowledge backing denial' is the wordplay.
'knowledge' becomes 'ken' (ken is a kind of knowledge**).
'backing' says the letters should be written backwards.
'denial' becomes 'nay' (nay is a kind of denial).
'nay' written backwards gives 'yan'.
'ken'+'yan'='KENYAN'
(Other definitions for kenyan that I've seen before include "Native of Nairobi, perhaps" , "Nationality of citizen of Nairobi" , "Native of Mombasa, perhaps?" , "Person from Nairobi, say" , "Native of Nairobi, say" .)