Related Clues:

• 'You there!'
• Attention-getting call
• "You, there!"
• "Howdy!"
• "Listen!"
• Cry of surprise
• Word of greeting
• Tripled, Yogi Bear's catchphrase
• Words to an 'old chap'
• "Yo!"
• "Watch it!"
• With 53-Across, a Beatles song
• Bloke's 'Well, well!'
• 'Howdy!'
• 'Because ___ so!'