Related Clues:

• Erato is one
• Calliope, for one
• Artist's "visitor"
• 23-Down is one
• Hebridean isle
• Clio, Erato or Urania
• Ponder, with ''over''
• Clio, Erato or Urania, e.g.
• Ruminate
• Melpomene, e.g.
• Meditate over
• See 23 Across
• Writer's inspiration
• There's one for dance
• Be introspective