Crossword Genius

Seeing one in the sky may be an omen (5)

Ross

I believe the answer is:

comet

(Other definitions for comet that I've seen before include "traveller covering huge mileage" , "One is named after Edmond Halley" , "Omen supposedly" , "Celestial object" , "Frozen body" .)

I've seen this clue in the Universal.
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