All the letters sent back to this country in Africa (5)
I believe the answer is:
zaire
This could be a double definition.
'all the letters sent back to this country' is the first definition.
'Zaire' can be an answer for 'country' (Zaire is an example). I'm unsure of the remainder of the definition.
'in africa' is the second definition.
('Zaire' is part of 'africa')
Can you help me to learn more?
(Other definitions for zaire that I've seen before include "renamed African area" , "Country, formerly" , "Until 1997 the name of the Democratic Republic of the Congo" , "Previous name of Congo" , "Previous name of African state, achieved independence from Belgium in 1960" .)