Possible Clues:

• Firehouse device (2 words)
• It might stop a break-in
• An aborted escapade -- two students snatching decoration � results in warning
• It's a loud warning for everyone holding onto marble collection
• One ringing to warn you of danger?
• Start of a drill, maybe
• Awakening alert
• A batter collecting runs, cricketer Warner
• Warning: a large branch by our cartoonist
• One sounds in a panic