Go over a picture needing editing after office hours perhaps (12)
I believe the answer is:
recapitulate
'go over' is the definition.
(I've seen this before)
I cannot understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for recapitulate that I've seen before include "Go over the main points again" , "go over old ground" , "Go over in summary" , "Repeat in summary" , "Sum up" .)