Summits on colonial hills and dales in Africa (4)
I believe the answer is:
chad
'in africa' is the definition.
('Chad' is part of 'africa')
I don't understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for chad that I've seen before include "foreign land" , "N.Central African Republic" , "African country and lake" , "North central African country, capital N'Djamena" , "African country south of Libya" .)