Emergency device (5)

I believe the answer is:

flare

(Other definitions for flare that I've seen before include "Sudden burst of flame" , "Blaze in feral manner" , "Warning light" , "signalling light" , "Feral kind of sudden activity" .)

I've seen this clue in the LA Times.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.