Invalid (4)

I think it could be either:

void

null

'invalid' is the definition.
(similar in meaning)

This is the entire clue.

(Other definitions for void that I've seen before include "Empty or vacant, like space" , "Emptiness, empty space" , "Containing nothing or not legally binding" , "Blank, invalid" , "Empty space or vacuum" .)

I've seen this clue in the Evening Standard, the Universal, the Newsday, The Irish Independent, the Penny Press, the USA Today, The Guardian, The Times, The Mirror, The New York Times and the LA Times.

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