Possible Clues:

• One comes back from Scotland in this ring - how alarming!
• It sounds as if to overturn the bed is very wrong
• A poison said to cause alarm
• In bed, rejected wrong alarm call
• By the sound of it, to turn the bed over - that's wrong
• Ring this to get the Scotsman from Ulster back
• Alarm bell, and other sounds of clock in hearing
• Alarm
• Alarm-bell needs to chime at first error
• Con, sit and produce an alarmbell