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Go back over note on evidence (7)

Ross

I believe the answer is:

retrace

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'go back over' is the definition.
(thesaurus)

'note on evidence' is the wordplay.
'note' becomes 're' (as in do-re-mi).
'on evidence' becomes 'trace' (trace is a kind of evidence. I am not sure about the 'on' bit.).
're'+'trace'='RETRACE'

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(Another definition for retrace that I've seen is " Go back over (one's steps)".)

I've seen this clue in The Guardian.
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