Hit parade terrible for discrimination (9)
I believe the answer is:
apartheid
'for discrimination' is the definition.
(thesaurus)
'hit parade terrible' is the wordplay.
'terrible' indicates anagramming the letters.
'hit'+'parade'='hitparade'
'hitparade' anagrammed gives 'APARTHEID'.
(Other definitions for apartheid that I've seen before include "Network of bars no longer" , "System of segregation formerly practised in South Africa" , "South Africa's former social policy - hit parade (anag)" , "regime" , "Tyrannical system in S Africa now abandoned" .)