First murder victim in Lincoln and first in Leicester (4)
I believe the answer is:
abel
'first murder victim' is the definition.
(Abel was murdered by his brother Cain in the Bible)
'lincoln and first in leicester' is the wordplay.
'lincoln' becomes 'abe' (Abraham Lincoln).
'and' is a charade indicator (letters next to each other).
'first in leicester' becomes 'l' (1st letter of 'leicester').
'abe'+'l'='ABEL'
'in' acts as a link.
(Other definitions for abel that I've seen before include "Son of Adam and Eve" , "Old Testament brother" , "The first recorded murder victim" , "Name" , "Second child" .)