Related Clues:
- Not easy to fool
- Fit for guard duty
- Warning - answer the French resistance on time!
- Tornado siren, e.g
- Keep one's eyes peeled for later trouble
- Keeping one's eyes open for later model
- Like a good watchdog
- It can be golf-ball sized
- Awake, attentive
- One who crooned Love is a Game
- Salute flag
- Fall of ice
- Vocally hearty welcome
- Falling stones
- Watchfully awake