Crossword Genius

Something cheeky, maybe, shown in genuine counter-argument (8)

Ross

I believe the answer is:

rebuttal

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'counter-argument' is the definition.
(I've seen this before)

I don't understand how the remainder of the clue works.

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(Other definitions for rebuttal that I've seen before include "Disproof" , "counterclaim" , "Confutation" , "Answer" , "Denial" .)

I've seen this clue in The Telegraph.
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