Crossword Genius

Make invalid (7)

Ross

I believe the answer is:

nullify

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

This is all the clue.

(Other definitions for nullify that I've seen before include "Make invalid" , "Make void" , "quash" , "Render void" , "Declare invalid" .)

I've seen this clue in The Guardian.
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