Crossword Genius

Sign seen at hen party? (4)

Ross

I believe the answer is:

omen

'sign' is the definition.
(I know that omen is a type of sign)

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

(Other definitions for omen that I've seen before include "Foreshadow" , "Forewarning, harbinger" , "Portent, prophetic indicator" , "Foreboding" , "Warning - sign" .)

I've seen this clue in The Times.
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