"Just kidding!" (3)

I think it could be either:

Which length description are you looking for?:

5 3*

'just kidding' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for not that I've seen before include "Word of negation" , "A negative word" , "logically, operation needed" , "Negation of what follows" , "In no way, never" .)

I've seen this clue in the Newsday, the USA Today, the Universal and The New York Times.

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