Crossword Genius

Sign is a bit gruesome (4)

Ross

I believe the answer is:

omen

I'm a little stuck... Click here to teach me more about this clue!

'sign' is the definition.
(omen is a kind of sign)

I don't understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for omen that I've seen before include "Forecast" , "Augury, portent" , "Foreboding" , "Auspice" , "Sign of likely future event" .)

I've seen this clue in the Irish Times (Crosaire) and the Irish Times.
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