Possible Clues:

• Nonet, for one
• Need to have an extra bit to make it nine
• Supreme Court justices, e.g.
• Just one over the eight
• Cutting introduction, wrote about Area Nine
• 22 across and an 8 more to make this one 9
• Group requiring whatever publicity is possible on radio
• Party of nine
• Ball team, e.g
• The Muses, for one