Stoppage time with Italian team getting goal (12)
I believe the answer is:
'stoppage time' is the definition.
(eg when a concert stops)
'italian team getting goal' is the wordplay.
'italian team' becomes 'inter' (Inter Milan FC).
'getting' is a charade indicator (letters next to each other).
'goal' becomes 'mission'.
'with' acts as a link.
(Other definitions for intermission that I've seen before include "Theatre's half-time" , "Pause, break" , "Break; respite" , "Interval" , "Entr'acte" .)