Possible Clues:

• Pound provided this, oddly enough
• On the house, gratis, comped, etc
• Not 'The Ballad of Reading Gaol'?
• Following battle's ending in defeat, liberated lines
• Like playing tennis with the net down, to Robert Frost
• Unrhymed poetry
• Priceless volume with Irish poetry
• Veers, perhaps, into unrestrained lines?
• Poetic style produces great excitement round about Home Counties
• Poetry without regular rhythm