Related Clues:

• First sound of the day, for many
• Some people lose sleep over this time waster perhaps starting panic
• Burglar scarer
• Roman Law dismissed now, and that's a sign of danger
• Ender of a good night's sleep, perhaps
• Sound of danger
• Sleep interrupter, perhaps
• Alma Mater has no team to put the wind up someone
• Option under Clock, on an iPhone
• Clock-radio sound
• Waker-upper of sorts
• A wake-up call for team sacrificed by Alma Mater
• Clock sound at 6 a.m., maybe
• Word with "fire"
• Frightening sort of clock?