Reason to pull over (5)

I believe the answer is:

siren

(Other definitions for siren that I've seen before include "Nymph supposed to have lured sailors to destruction on rocks" , "Warning device - femme fatale" , "Loud whistle or kind of witch" , "Loud whistle or dangerous woman" , "Charmer" .)

I've seen this clue in The Wall Street Journal and the Universal.

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