Crossword Genius

Granny perhaps on tape? Au contraire! (3)

Ross

I believe the answer is:

not

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'au contraire' is the definition.
(I've seen this in another clue)

I don't understand the remainder of the clue.

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(Other definitions for not that I've seen before include "Ton (anag.)" , "Having close-cut hair" , "It negates a word" , "Word of negation" , "Negation of what follows" .)

I've seen this clue in the Sydney Morning Herald.
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