Related Clues:

• Warning bell
• Glum
• Eye opener, of a sort
• Out of order
• Chili-hotness measure
• Perturbation
• Where you're going after the next clue
• Clock partner
• Snooze, for one
• It might scream after being tripped
• Eyeopener?
• Warning signal
• Like this clue
• Firebox feature
• Trepidation