Final result (3)
'final result' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for upshot that I've seen before include "Event" , "Outcome, final result" , "Eventual outcome or conclusion" , "anti-aircraft fire?" , "Outcome of vertical discharge?" .)
I believe this is a double definition.
'final' is the first definition.
(synonyms)
'result' is the second definition.
(I've seen this in other clues)
(Other definitions for end that I've seen before include "result" , "Intention" , "Time to break-up (3,2,4) - See 12" , "Aim; terminate" , "'Finish, cease (3)'" .)
(Other definitions for outcome that I've seen before include "End result" , "'Result, upshot (7)'" , "Eventuality" , "answer" , "consequences" .)