Crossword Genius

Warning - femme fatale! (5)

Ross

I believe the answer is:

siren

I believe this clue is a double definition.

'warning' is the first definition.
(thesaurus)

'femme fatale' is the second definition.
(I've seen this before)

(Other definitions for siren that I've seen before include "Seductress" , "Warning sound" , "Vamp; alarm" , "Hooter - dangerous woman?" , "Bewitching singer" .)

I've seen this clue in The Telegraph.
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