Crossword Genius

Null and void (7)

Ross

I believe the answer is:

invalid

'null and void' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for invalid that I've seen before include "Void; patient" , "Having no effect" , "to be in poor health" , "Disable" , "patient [found]" .)

I've seen this clue in The Sun, The Mirror, the King Feature Syndicate, The Telegraph and the Newsday.
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