Related Clues:

• Word of approval
• 'Would you look at that?!'
• Audible admiration
• Ten C-notes
• 'Terrif!'
• Aah partner
• "Fancy that!"
• "I'm impressed!"
• "Nifty!"
• Crowd's gasp
• Sound of amazement
• "Shucks!"
• "Go right, mule!"
• 'Isn't that pretty!'
• Exclamation in 17, 23, 50 and 61-Across