Warning device in a building (4,5)

I believe the answer is:

fire alarm

(Other definitions for fire alarm that I've seen before include "Safety device" , "Warning of conflagration" , "Warning to evacuate" , "It warns of smoke and flames" , "Warning device" .)

I've seen this clue in the Sydney Morning Herald.

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.