Crossword Genius

Invalidate (5)

Ross

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'invalidate' is the definition.
(I know that invalidate can be written as annul)

This is the entire clue.

(Other definitions for annul that I've seen before include "Countermand" , "Cancel, revoke" , "Make invalid" , "Cancel or render void" , "Obligation" .)

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