Related Clues:

• Phone sound
• Foreman's locale?
• Call up
• Thunderous sound
• Ominous sound
• Circus stage
• Prizefight milieu
• Burst of laughter
• "Hello" preceder
• Word with brass or key
• Sound from Big Ben
• Symbol of constancy
• Sign of age?
• Pugilists' milieu
• Engagement offering