A note to finish a list of things to be done (6)
I believe the answer is:
agenda
'list of things to be done' is the definition.
(I've seen this in another clue)
'a note to finish a' is the wordplay.
'a note' becomes 'ag' (I can't explain this - if you can you should give a lot more credence to this answer).
'to finish' becomes 'end' ('end' can be a synonym of 'finish').
'ag'+'end'+'a'='AGENDA'
Can you help me to learn more?
(Other definitions for agenda that I've seen before include "Topics for a meeting" , "Schedule of items for meeting" , "Items for discussion at committee meeting" , "List of matters to be discussed at a meeting" , "To-do list" .)