After seeing that (5)
I believe the answer is:
since
This clue is a double definition.
'after' is the first definition.
(I've seen this in other clues)
'seeing that' is the second definition.
(I've seen this before)
(Other definitions for since that I've seen before include "in the past" , "From that time one" , "Because; ago" , "Seeing that" .)