Retrospective criminal charge accepted and shared (8)
I believe the answer is:
partaken
'shared' is the definition.
('partake' can be a synonym of 'share')
'retrospective criminal charge accepted' is the wordplay.
'retrospective' is a reversal indicator.
'criminal charge' becomes 'rap' (as in taking the rap for something).
'accepted' becomes 'taken' ('take' can be a synonym of 'accept').
'rap' written backwards gives 'par'.
'par'+'taken'='PARTAKEN'
'and' is the link.
(Other definitions for partaken that I've seen before include "Eaten some (of food/drink)" , "Shared" , "Joined" , "Participated" .)