Related Clues:

• Antitheft device
• Message frantically tapped out
• Mayday call
• Motorist's aid
• Skipper's plea
• Help wanted sign?
• Only hit song for which title and artist are both palindromes
• Puppy's plaint
• Head tail?
• An obvious cry for help
• Wake-up call
• Coded plea
• Sea call
• Morse code message
• Roadside beacon