Made light of American replacing English language in Africa (5)
I believe the answer is:
shona
'language in africa' is the definition.
(language of Zimbabwe)
I don't understand the remainder of the clue.
(Other definitions for shona that I've seen before include "African language" , "Language of southern Africa" , "foreign language" , "Scotswoman'" , "Member of a Bantu people living in Zimbabwe" .)