Crossword Genius

Warning sound (5)

Ross

I think it could be either:

siren

alarm

(Other definitions for alarm that I've seen before include "Daunt" , "Warning siren" , "Distress signal" , "Unnerve" , "Consternation: kind of clock" .)

I've seen this clue in The Times, the King Feature Syndicate, The Guardian and The New York Times.
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