Possible Clues:

• Fountain of Dixieland
• Folkie Seeger
• 'The Mod Squad' role
• "Our Gang" dog
• Rose high in some people's estimation
• Name that can precede the first word of 17-, 38- or 60-Across
• Rival of Andre
• Tennis rival of Andre
• Wentz of 'Fall Out Boy'
• Our Gang pooch