Eve's third son (4)
I believe the answer is:
seth
'eve's third son' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for seth that I've seen before include "Indian novelist, Vikram" , "Cain and Abel's younger brother" , "Younger brother to Cain and Abel" , "Early man" , "One of the first men" .)