Related Clues:

• Determine
• Erato is one
• Calliope, for one
• Artist's "visitor"
• Envisage
• Judge to be probable
• 23-Down is one
• Muse
• Believe to be
• Hold an opinion
• Create concepts
• Clio, Erato or Urania
• Clio, Erato or Urania, e.g.
• Ruminate
• Form notions