Mother of Cain and Abel (3)
I believe the answer is:
eve
'mother of cain and abel' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for eve that I've seen before include "See 13 Across" , "She reportedly lived first" , "Adam's wife" , "comes before Jan. 1st" , "Brink" .)