Crossword Genius

Declare invalid (5)

Ross

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annul

'declare invalid' is the definition.
(I've seen this before)

This is the entire clue.

(Other definitions for annul that I've seen before include "Cancel officially" , "Invalidate" , "Countermand" , "Cancel, make void" , "Nullify" .)

I've seen this clue in The Telegraph, the USA Today, The Irish Times, The Times and The Guardian.
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