Lists of things to do include to bring back an Icelandic tale with the finish in (7)
I believe the answer is:
agendas
'lists' is the definition.
(agenda is a kind of list)
'back an icelandic tale with the finish in' is the wordplay.
'back' says the letters should be written in reverse.
'an icelandic tale' becomes 'saga' (I've seen this in another clue).
'with' means one lot of letters goes inside another.
'the finish in' becomes 'end' (I can't explain this - if you can you should give a lot more credence to this answer).
'saga' in reverse letter order is 'agas'.
'agas' going around 'end' is 'AGENDAS'.
'of things to do include to bring' is the link.
This may not be right. Some or all of it may belong to another bit of the clue.
Can you help me to learn more?
(Other definitions for agendas that I've seen before include "Schedules" , "Lists of matters to be taken up at meetings" , "programmes" , "Orders of business" , "Committee-matters" .)