Crossword Genius

Round number (4)

Ross

I believe the answer is:

'round number?' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for zero that I've seen before include "Rock bottom" , "Duck" , "Worthless person" , "Nought, nothing" , "Japanese fighter" .)

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