Related Clues:

• Plenty
• Distress signal
• Smidgen
• Police radio alert, briefly
• Police radio msg.
• Help wanted advertisement?
• Alert, for short
• This puzzle's theme
• 'Not guilty,' e.g.
• 'Help!'
• Emotional request
• Police alert, for short
• 'Send help!'
• Letters of urgency
• What a patrol car might get, for short