Related Clues:

• Gathering clouds, say
• Prophet's wish
• Breaking a mirror, maybe?
• 'Look out!'
• On your toes
• Affright
• With eyes wide open
• It might help you get up
• Hazard
• Mentally responsive
• Word with smoke or fire
• Item that may be connected to a car's ignition
• It may be red
• 'As is,' e.g.
• Danger sign