American brass bass (sousaphone) player, born 1890 in Cambridge, MD, died 1955 in New York.
Moved to New York c. 1925, where he worked with Wilbur De Paris and Charlie Johnson, making recordings with the latter. St. Clair recorded with Clarence Williams's orchestra 1926-1929, also accompanying singers, among others Bessie Smith. He recorded again with Williams in the mid-1930s. He ceases working as amusician for some time, but partook in Rudi Blesh's radio series This is Jazz in 1947 and recorded with Tony Parenti's Ragtimers.