Having known what was going on, is among those shot (2,3,7)
I believe the answer is:
in the picture
'having known what was going on' is the definition.
I don't know anything about this answer so I cannot judge whether it can be defined by this definition.
'among those shot' is the wordplay.
'among' becomes 'in' (eg among or in a group).
'those' becomes 'the' (I can't explain this - if you can you should give a lot more credence to this answer).
'shot' becomes 'picture'.
'in'+'the'+'picture'='IN THE PICTURE'
'is' is the link.
Can you help me to learn more?
(Other definitions for in the picture that I've seen before include "stars' location" , "like the shutterbug's subject?" , "Film star is" , "what the subject of a portrait must be" , "Fully informed" .)