Related Clues:

• See 21-Across
• 'Heavens!'
• 'That's incredible!'
• 'No kidding'
• See 30-Across
• 'Is that so!'
• Bloke
• See 41-Down
• Comment before 'I don't know'
• 'That's amazing!'
• Fellow
• Opposite of 1-Down
• Geezer
• 'I'm impressed!'
• Word before 'I don't know'