It was formerly Leopoldville (8)
I believe the answer is:
kinshasa
'it was formerly leopoldville' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for kinshasa that I've seen before include "Congolese capital" , "Shank is a strange African city" , "Capital of Dem Rep of the Congo" , "Capital of the Democratic Republic of the Congo" , "It was formerly Leopoldville" .)