Related Clues:

• Sound a Klaxon
• Fully conscious
• Common cell phone feature
• Clear-witted
• Loud get-up?
• Full of NoDoz
• Not dozing
• Reason to get up in the morning?
• Break-in indicator
• Fully attentive
• Surprise big-time
• Rousing ringer
• Security device
• Car antitheft device
• Like good watchmen