Crossword Genius

A rainbow may be seen as a good one (4)

Ross

I believe the answer is:

omen

(Other definitions for omen that I've seen before include "Gloomy sign" , "Sign of likely future event" , "Augur" , "Forewarning, harbinger" , "Straw in the wind" .)

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