Crossword Genius

Null and void (7)

Ross

I believe the answer is:

invalid

<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">null and void</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>

(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 Telegraph, the Newsday, the King Feature Syndicate, The Times, The Mirror and The Sun.
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