… going back over call about electronic victory by Democrat (9)

'going back over' is the definition.
(rewind can mean to go over or go back over)

'call about electronic victory by democrat' is the wordplay.
I cannot quite understand how this works, but
'about' could be 're' ('re' means regarding or about) and 're' is found within the answer.
'victory' could be 'win' (a win is a victory) and 'win' is located in the answer.
'democrat' could be 'd' and 'd' is located in the answer.
This may be the basis of the clue (or it may be nonsense).