Check evidence and scan (9)
I believe the answer is:
proofread
'check' is the definition.
(I know that proofread is a type of check)
'evidence and scan' is the wordplay.
'evidence' becomes 'proof' (evidence proves something).
'and' says to put letters next to each other.
'scan' becomes 'read' (synonyms).
'proof'+'read'='PROOFREAD'
(Other definitions for proofread that I've seen before include "correct text" , "Carefully check" , "Prepare for publication" , "Checked text" .)