Indeed not all went (8)
I believe the answer is:
departed
'went' is the definition.
('depart' can be a synonym of 'go')
'indeed not all' is the wordplay.
I cannot really see how this works, but
'not all' could be 'part' ('part' is the opposite to 'all') and 'part' is found within the answer.
The remaining letters 'deed' is a valid word which might be clued in a way I don't understand.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for departed that I've seen before include "Left, went away" , "Quit" , "completely breathless" , "Gone, maybe dead" , "Went - dead" .)