Common ancestor? (4)
I believe the answer is:
adam
'common ancestor?' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for adam that I've seen before include "Fellow" , "First fruit-eater" , "According to the Bible, progenitor of the human race" , "Father of Cain and Abel" , "Biblical first man" .)