Possible Clues:

• A literary art
• Odes, e.g
• Author to sample verse
• 'The only thing that matters': cummings
• "The only thing that matters": cummings
• Typically, in a slim volume one may write it or type, perhaps
• Author having shot at verse
• Literary form
• Work by Keats or Shelley, say
• American writer with taste producing 'The Raven'?