Granny perhaps on tape? Au contraire! (3)
I believe the answer is:
not
'au contraire' is the definition.
(I've seen this in another clue)
I don't understand the remainder of the clue.
Can you help me to learn more?
(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" .)