In pursuit later on (5)
I believe the answer is:
after
This clue is a double definition.
'in pursuit' is the first definition.
(I've seen this in another clue)
'later on' is the second definition.
(I've seen this in another clue)
(Other definitions for after that I've seen before include "Subsequent to" , "Chasing" , "Behind; seeking" , "Coming later in time" , "In pursuit of, behind" .)