Segregation (9)
I believe the answer is:
apartheid
'segregation' is the definition.
(apartheid is a kind of segregation)
This is the entire clue.
(Other definitions for apartheid that I've seen before include "Tyrannical system in S Africa now abandoned" , "System of segregation formerly practised in South Africa" , "Network of bars no longer" , "divisive policy" , "Former South African political system" .)