Ion the 1920 Wheeler Census he says born in NC, but on the 1910 Montgomery County Census he notes that he was born in GA.
This may be him in 1930:
Baldwin County: Ga State Penitentiary
Ellis Calrk, prisoner, 46, married, born GA.
Then there was an Ellis Clarke who died in Baldwin County on June 8, 1933, certificate number 11964.