Related Clues:

• Blew a horn
• Paged
• Beeped
• Trumpeted
• Proclaimed flamboyantly
• Tried to contact
• Hit the horn
• Summoned, in a way
• Sounded the horn
• Went off, as a timer
• Blew the whistle
• Went off like a smoke detector
• Proclaimed noisily
• Sounded a trumpet, e.g.
• Played the horn