Biblical character, presidential predecessor of Andy J? (4)

I believe the answer is:

abel

I'm a little stuck... Click here to teach me more about this clue!

'biblical character' is the definition.
(I've seen this in another clue)

I don't understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for abel that I've seen before include "Cain's victim; - Magwitch (Great Expectations)" , "Biblical murder victim" , "He was slain by Cain" , "Eve's son" , "Early murder victim" .)

I've seen this clue in The Times.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.