Adam and Eve's third child (4)
I believe the answer is:
seth
'adam and eve's third child' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for seth that I've seen before include "Younger brother to Cain and Abel" , "Adam and Eve's third son" , "Boy" , "In disguise, the brother of Cain and Abel" , "Boy's name" .)