Crossword Genius

Warning instrument (5)

Ross

I believe the answer is:

siren

(Other definitions for siren that I've seen before include "Hooter - femme fatale" , "Loud whistle or sailors' enchantress" , "Temptress - makes a loud noise!" , "Device producing a loud wailing sound as a signal" , "Temptress - warning device" .)

I've seen this clue in The Times.
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