There is a Martin L. Sheffield listed with wife Bitha and 6 children, including 14 year old Dora E., residing in Illwill, Clinton County, KY in 1920. This is Martin Luther Sheffield, son of Isaac Newton Sheffield and Elizabeth Cole. Isaac is the son of William Sheffield and Lucinda Kindred. William is the son of George Sheffield and Mary Job. Elizabeth is the daughter of James Cole and Elvira Little. Lucinda is the daughter of Martin Kindred and Elizabeth Evans. Mary is the daughter of David Job and Abigail Denton. Since there are no Sherfield's or Sheffield's listed in the 1920 census for Clay County, TN, and Sherfield can be a variant spelling of Sheffield, and Clay County TN is bordered on the north by Clinton County, KY, this may be the person for whom you seek.