Related Clues:

• Sound in an emergency
• Ambulance attachment
• Seductive lurer
• Patrol car wailer
• Maritime hazard
• Come-hither type
• Lurer on the Rhine
• Fire engine's wail
• Sultry singer
• Her songs lure Rhine boatmen
• Engine sound?
• Fire indicator, perhaps
• Alluring woman
• Legendary German singer
• Police car's sound