Denouement in story written up in programmes (7)
I believe the answer is:
agendas
'programmes' is the definition.
(agenda is a kind of programme)
'denouement in story written up' is the wordplay.
'denouement' becomes 'end' (the end or conclusion of a story).
'in' means one lot of letters goes inside another.
'story' becomes 'saga' (saga is a kind of story).
'written up' says the letters should be written in reverse.
'saga' written backwards gives 'agas'.
'end' placed within 'agas' is 'AGENDAS'.
'in' acts as a link.
(Other definitions for agendas that I've seen before include "Schedules" , "Orders of business" , "Committee-matters" , "Lists of matters to be taken up at meetings" , "programmes" .)