Related Clues:

• Like good watchmen
• Clock signal
• Fully awake
• Bright-eyed
• Home security component
• Word with ''smoke'' or ''fire''
• Waker-upper
• Give a heads-up
• Elevator button
• It was raised by Paul Revere
• Type of post-caffeine state
• Percipient
• Slumber stopper
• ''Heads up!'' e.g.
• Sound the alarm