Crossword Genius

Part of an emergency warning system (5)

Ross

I believe the answer is:

siren

(Other definitions for siren that I've seen before include "Warning device, alluring woman" , "Device producing a loud wailing sound as a signal" , "Loud warning device" , "Charmer" , "Rinse (anag) - sea nymph" .)

I've seen this clue in the LA Times.
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