Having no legal force (4)

I believe the answer is:

null

'having no legal force' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for null that I've seen before include "Without force, validity" , "Lacking any legally binding force" , "Invalid, void" , "Non-existent and void" , "Amounting to nothing" .)

I've seen this clue in The Mirror, The Wall Street Journal and The Times.

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