Possible Clues:

• It was 'Written in a Country Church-Yard'
• Stoke thoughts of egg layer's faulty chromosome
• Man perhaps mostly set on interrupting extremely ghastly old poem
• After ages in America, English stage unknown work in verse
• Famous poem
• Shining lines in set, say, written by edge of yard?
• It was Written in a Country Church-Yard
• The curfew tolls the knell of parting day poem
• Poem written at Stoke Poges church
• Poem - eggy layers (anag)