Possible Clues:

• Historian Nevins
• The A of E.A.P.
• Edgar -- Poe
• Mystery writer's middle name
• Glasvegas frontman James
• The 'A' of E. A. Poe
• "Hello Muddah, Hello Fadduh" singer Sherman
• Mystery middle name
• Poe’s middle name
• The A in EAP