Related Clues:

• Sounds as if it's calling attention to a border
• The way to call for attention at a Border?
• By the sound of it, a border that's not the border of 24 across
• A Border call for attention
• Call for attention at a Border
• Call for attention on a Border
• 'May I have your attention?'
• The sound of a border clearance
• A border clearance, by the sound of it
• Does this call attention to a Border?
• The sound of a clearance on the Border
• 'By the sound of it, a clearance for a border (4)'
• Sound of a clearance for a border
• By the sound of it, a clearance for a border
• Whispered attention-getter