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Invalidate (5)

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'invalidate' is the definition.
(thesaurus)

This is the entire clue.

(Other definitions for rebut that I've seen before include "Deny claim" , "Brute (anag)" , "Rebuff; deny" , "Overturn" , "Confute" .)

I've seen this clue in The Guardian, The Wall Street Journal, the Universal, the Penny Press, The Telegraph, the Sydney Morning Herald and the Newsday.
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