Abraham Lincoln's first murder victim in good book (4)
I believe the answer is:
abel
'victim in good book' is the definition.
'abel' can be an answer for 'victim' (murder victim in the Bible). I'm not sure about the 'in good book' bit.
'abraham lincoln's first murder' is the wordplay.
I cannot really understand how this works, but
'abraham' could be 'abe' and 'abe' is found within the answer.
'lincoln's first' could be 'l' (1st letter of 'lincoln') and 'l' is found in the answer.
This accounts for all the letters.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for abel that I've seen before include "One man was murdered" , "Cornish city" , "character in the Bible" , "Son of Adam and Eve" , "Biblical murder victim" .)