Prompt takes against Antigone’s part (7)

I believe the answer is:

instant

'prompt' is the definition.
(thesaurus)

'takes against antigone's part' is the wordplay.
'part' says the answer is hidden in the clue.
'INSTANT' is hidden within 'takes against antigones'.

(Other definitions for instant that I've seen before include "Jiffy" , "Precise moment" , "Sudden; moment" , "No need to cook" , "Short time, of the current month" .)

I've seen this clue in The Times.

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