Possible Clues:

• The very one might even be more
• More like it? The very thing!
• Phrase used to express admiration — lesson (anag)
• Minimum expected in piano lesson surprisingly
• '... if you can believe it'
• Number reduced, would you believe?
• “...amazingly enough!”
• ''. . . surprisingly''
• Not one younger, would you believe?
• ''. . . and you can believe that''