Succeeding in chasing? (5)
I believe the answer is:
after
I believe this clue is a double definition.
'succeeding' is the first definition.
(I've seen this in another clue)
'chasing?' is the second definition.
(I've seen this in another clue)
'in' is the link.
(Other definitions for after that I've seen before include "since" , "Subsequently" , "Chasing" , "Searching for" , "In the time following" .)