Crossword Genius

Invalid possessing no legal power (4)

Ross

I believe the answer is:

null

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

I cannot understand how the remainder of the clue works.

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(Other definitions for null that I've seen before include "Without force, validity" , "Legally void" , "Useless - nothing" , "Without value or consequence" , "Invalid, void" .)

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