Changes seen in cast, I decided to retire (5)
I believe the answer is:
edits
'changes' is the definition.
(editing is a kind of changing)
'in cast i decided to retire' is the wordplay.
'in' indicates the answer is hidden within the clue.
'to retire' is a reversal indicator.
'stide' can be found hidden inside 'cast i decided'.
'stide' written backwards gives 'EDITS'.
'seen' is the link.
(Other definitions for edits that I've seen before include "Checks" , "Proofreads" , "Corrects" , "Revises" , "Directs newspaper production" .)