Crossword Genius

Dark clouds, e.g (4)

Ross

I believe the answer is:

omen

(Other definitions for omen that I've seen before include "Portent, prophetic indicator" , "Sign of a future event, good or bad" , "Sign of things to come" , "premonition" , "Sign of likely future event" .)

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