Luanda is its capital city (6)
I believe the answer is:
angola
'luanda is its capital city' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for angola that I've seen before include "West African country" , "SW African republic, capital Luanda" , "Republic of SW Africa" , "It's no gala in this African country" , "SW African country" .)