Possible Clues:

• Only Mississippi-born Literature Nobelist
• William ..., US novelist whose works were set in the southern states
• 1949 Nobel laureate for Literature
• William ..., US novelist who wrote about people in the southern states
• Literature Nobelist who wrote 1953's 'The Lying Days'
• 'As I Lay Dying' novelist
• William ..., US winner of 1949 Nobel Prize for Literature had rank flue
• William --, US novelist (1897-1962)
• 'The Sound and the Fury' author
• US novelist who wrote about people in the southern states