After that, next (4)
I believe the answer is:
then
This clue is a double definition.
'after that' is the first definition.
(synonyms)
'next' is the second definition.
(both can mean subsequently)
(Other definitions for then that I've seen before include "soon?" , "Consequently" , "Afterwards - as a result" , "Once upon a time" , "At that time; next" .)