Biblical figure (4)
(Other definitions for adam that I've seen before include "One of our common ancestors?" , "First Christian ancestor" , "Biblical first human" , "__ Smith, author of The Wealth of Nations" , "neoclassical style" .)
(Other definitions for abel that I've seen before include "One man was murdered" , "He was slain by Cain" , "Adam's boy" , "murdered second son?" , "Early murder victim" .)