Possible Clues:

• Nursery rhyme merchant
• Simple Simon met one
• Nursery rhyme vendor
• Whom Simple Simon met
• Anthropologist's objective in Melton Mowbray?
• Simple for Simon to have met one so crusty
• To earn a crust, he will sell one
• Merchant whom Simple Simon met
• Pastry cook of old
• Vendor on the way to the fair