Africans' leaders in no doubt even Britain expects little else (7)
I believe the answer is:
ndebele
'africans'' is the definition.
(ethnic group of southern Africa)
'leaders in no doubt even britain expects little else' is the wordplay.
'leaders in' indicates taking the first letters.
The initial letters of 'no doubt even britain expects little else' is 'NDEBELE'.
(Other definitions for ndebele that I've seen before include "Africans" , "African people" .)