Go back over Charity Bar Day (7)
I believe the answer is:
recross
'go back over' is the definition.
'charity bar day' is the wordplay.
'charity' becomes 'redcross'.
'bar' is a deletion indicator.
'day' becomes 'd'.
'redcross' with 'd' taken out is 'RECROSS'.
I've seen this clue in The Telegraph.
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