Second calling? (5)
(Other definitions for alias that I've seen before include "stage name, perhaps" , "Alternative name" , "Handle that isn't genuine" , "False identity" , "False or assumed name" .)
(Other definitions for nickname that I've seen before include "Friendly appellation by which person is known" , "term for someone" , "Add soubriquet to" , "Sobriquet" , "Familiar appellation" .)