Result not in has to arrive (7)
I believe the answer is:
outcome
'result' is the definition.
(I know that result can be written as outcome)
'not in has to arrive' is the wordplay.
'not in' becomes 'out' ('out' is the opposite to 'in').
'has' is a charade indicator (letters next to each other).
'to arrive' becomes 'come' ('come' can be a synonym of 'arrive').
'out'+'come'='OUTCOME'
(Other definitions for outcome that I've seen before include "Consequence, effect" , "Denouement" , "Consequence, upshot" , "Eventuality" , "Result or consequence" .)