Related Clues:

• Word of mock horror
• 'Heavens!'
• Old-time oath
• 'That's incredible!'
• 'No kidding'
• See 30-Across
• 'Is that so!'
• Bloke
• See 41-Down
• Son
• Comment before 'I don't know'
• Major Hoople's outburst, in old comics
• 'That's amazing!'
• Fellow
• Opposite of 1-Down