Mistake visiting editor passed? (7)
I believe the answer is:
elapsed
'passed?' is the definition.
('elapse' can be a synonym of 'pass')
'mistake visiting editor' is the wordplay.
'mistake' becomes 'lapse' (lapse is a kind of mistake**).
'visiting' indicates putting letters inside.
'editor' becomes 'ed'.
'lapse' put inside 'ed' is 'ELAPSED'.
(Other definitions for elapsed that I've seen before include "Pleased to have passed" , "slipped away" , "Expired" , "Pleased (anag.)" , "Went by" .)