Incident (7)
I believe the answer is:
episode
'incident' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for episode that I've seen before include "Instalment; event" , "Incident in a story or part of a serial" , "Part of a broadcast serial, say" , "Incident or event as part of sequence" , "Instalment; incident" .)