Revise, as text
I believe the answer is:
emend
'revise as text' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for emend that I've seen before include "Improve (writing)" , "get rid of faults" , "Remove faults from" , "Improve by altering" , "Alter something written to correct errors" .)