Subsequent; afterwards (5)
I believe the answer is:
later
This clue is a double definition.
'subsequent' is the first definition.
(similar in meaning)
'afterwards' is the second definition.
(I know that afterwards can be written as later)
(Other definitions for later that I've seen before include "At a subsequent time" , "In due course" , "After a given point in time" , "At a time in the future" , "Afterward, subsequent" .)