Possible Clues:

• Rancid butter firmly grasped
• Not eating a little butter? Well remembered
• Remembered exactly Dicky having stroke
• Learned thoroughly from Englishwoman or Irishman
• Perfectly memorised
• Rancid milk on the turn? Exactly
• Recalled perfectly rancid butter
• Memorised exactly
• Could be postman's indisposed previously to the letter
• Exactly memorised start time covering each year