Setters’ revised notes exclude key reminders of past events (8)
I believe the answer is:
mementos
'reminders of past events' is the definition.
(I've seen this before)
'setters' revised notes' is the wordplay.
'setters'' becomes 'mem' (I am not sure about this - if you are sure you should believe this answer much more).
'revised' is an anagram indicator.
'notes' anagrammed gives 'entos'.
'mem'+'entos'='MEMENTOS'
'exclude key' is the link.
This may not be correct. Some or all of it may belong to another bit of the clue.
Can you help me to learn more?
(Other definitions for mementos that I've seen before include "Keepsakes" , "Tense mom with souvenirs" , "Reminders of past events" .)