Mocking revolting racialist (9)

I believe the answer is:

satirical

'mocking' is the definition.
(I've seen this before)

'revolting racialist' is the wordplay.
'revolting' indicates anagramming the letters.
'racialist' is an anagram of 'SATIRICAL'.

(Other definitions for satirical that I've seen before include "scornful" , "of burlesque" , "Ironic - sarcastic" , "Ridiculing" , "Poking fun at" .)

I've seen this clue in The Daily Express.

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