Crossword Genius

Declare invalid (7)

Ross

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5

7

nullify

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

This is all the clue.

(Other definitions for nullify that I've seen before include "In fully (anag.)" , "Make void" , "Make invalid" , "Invalidate" , "Declare invalid" .)

I've seen this clue in The Guardian and The Telegraph.
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