Possible Clues:

• Both sides gathering round English linesman
• He brought out the 21s, it's said, to gain our attention
• Poet offers pound and gold
• Poet who died at Florence - from England, originally
• Property alternative for illusory interlocutor
• See 5 Down
• English poet, author of Imaginary Conversations (1824-9)
• Walter S. ---, poet