Unfortunately I know nothing about Emily Clear (other than she was a daughter of John K Clear). According to census information, she was born abt 1845. I did not know that she was married to Stanford Mayes. I have not run across "Mayes" or "Mays" in other Clear unions; however, I'll now keep my eyes open. Please keep me posted in your continued search.
P.S. I did find an entry for Stanford H Mayes/Mays in Co F, 1 (Turney's) Tennessee Infantry (CSA). Is this your man? (Did he migrate to TN?)