Related Clues:
- Gesture
- Early warning
- Taking it all in
- Gesture to convey information
- Thinking or acting quickly
- Colorful warning, often
- Wide awake to a siren call
- Danger signal, e.g
- Keenly attentive
- Sharp tip off
- All-points bulletin, e.g
- Like prairie dogs, notably
- Offer a heads-up
- Keeping one's eyes peeled at crumbling alter
- Watch chain not originally belonging on watch?