Rescheduled November replay that all can attend (7)
I believe the answer is:
plenary
'that all can attend' is the definition.
(meeting that anyone can attend)
'rescheduled november replay' is the wordplay.
'rescheduled' indicates an anagram (I've seen 'reschedule' mean this (I've seen this in other clues)).
'november' becomes 'N' (phonetic alphabet: alpha, bravo, charlie etc.).
'n'+'replay'='nreplay'
'nreplay' is an anagram of 'PLENARY'.
(Other definitions for plenary that I've seen before include "Full meeting" , "book of epistles" , "for everybody" , "Meeting attended by whole conference" , "(Of meeting) attended by all eligible" .)