Academic, after charge reviewed, is sorry (6)
I believe the answer is:
pardon
'sorry' is the definition.
(I've seen this before)
'academic after charge reviewed' is the wordplay.
'academic' becomes 'don' (type of academic - especially at Oxbridge).
'after' is a charade indicator (letters next to each other).
'charge' becomes 'rap' (I've seen this in another clue).
'reviewed' is a reversal indicator.
'rap' backwards is 'par'.
'don' after 'par' is 'PARDON'.
'is' is the link.
(Other definitions for pardon that I've seen before include "Allow to go unpunished" , "Excuse me, kindly overlook" , "Forgive or remit" , "Forgive the polite interruption" , "Forgive or excuse (an offence)" .)