Discrimination in hit parade after a fashion (9)
I believe the answer is:
apartheid
'discrimination' is the definition.
(thesaurus)
'hit parade after a fashion' is the wordplay.
'after a fashion' is an anagram indicator.
'hit'+'parade'='hitparade'
'hitparade' with letters rearranged gives 'APARTHEID'.
'in' acts as a link.
(Other definitions for apartheid that I've seen before include "Former South African system of racial separation" , "System of segregation formerly practised in South Africa" , "Network of bars no longer" , "Defunct system of segregationist government in South Africa" , "Social policy of racial segregation" .)