Possible Clues:

• A substance athlete mustn't take for a heavenly body
• Radio set retuned to way-out rock
• Small orbiting rock
• Heavenly body of retrospective designer - and French sex appeal
• Lump of rock orbiting the sun
• A compound that's organic in space
• There's little of it in space
• Ceres or Eros, e.g.
• Heavenly body a banned drug can build
• A body-builder circling rock