"Am I my brother's keeper?" brother (4)
I believe the answer is:
abel
'am i my brother's keeper? brother' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for abel that I've seen before include "one killed early" , "Slain biblical brother" , "character in the Bible" , "Adamson" , "Brother killed by Cain" .)