Plans finale in story with a twist (7)
I believe the answer is:
agendas
'plans' is the definition.
(agenda is a kind of plan)
'finale in story with a twist' is the wordplay.
'finale' becomes 'end' (I've seen this before).
'in' is an insertion indicator.
'story with' becomes 'saga' (I can't justify this - if you can you should believe this answer much more).
'a twist' says the letters should be written in reverse (I've seen 'twisted ' mean this).
'saga' reversed gives 'agas'.
'end' going inside 'agas' is 'AGENDAS'.
Can you help me to learn more?
(Other definitions for agendas that I've seen before include "Schedules" , "Orders of business" , "programmes" , "Committee-matters" , "Lists of matters to be taken up at meetings" .)