Related Clues:
- Siren or bell
- Like a good lookout
- See 9 Across
- Wake-up call, say
- Not easy to fool
- It might stop a burglar
- Great concern
- *Frighten
- Fit for guard duty
- Warning - answer the French resistance on time!
- Fill with dread
- Tornado siren, e.g
- Keep one's eyes peeled for later trouble
- Keeping one's eyes open for later model
- Like a good watchdog