Possible Clues:

• Poem by John Keats
• Poem in four books by John Keats
• The moon sleeps with him, and would not be awaked, said Portia
• Clumsily done, in my long poem
• Long poem by Keats done in my style
• Novel version of Keats work, by Disraeli
• Craftily done in my novel
• Keats poem done in my style
• Poem's conclusion that will enthrall me in another way
• Poem done in my break