African having quit ought to return at intervals (4)
I believe the answer is:
'african' is the definition.
(Hutus are an African ethnic group)
I can't explain the remainder of the clue.
(Other definitions for hutu that I've seen before include "Bantu speaker from Rwanda or Burundi" , "Rwandan or Burundian" , "African" , "Member of a Bantu people living in Rwanda and Burundi" , "Africans" .)