Crossword Genius

Kind of clock that's ultraprecise (6)

Ross

I believe the answer is:

atomic

(Other definitions for atomic that I've seen before include "Sort of bomb, number, or power" , "Basically simple" , "Using nuclear energy" , "I'm Cato (anag.)" , "Like some clocks" .)

I've seen this clue in The New York Times.
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