Language group that includes Swahili (5)
I believe the answer is:
bantu
'language group that includes swahili' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for bantu that I've seen before include "Family of southern African languages" , "10 across language" , "Type of language" , "Widely-spoken group of African languages" , "African language group" .)