Correct (text) (5)
I believe the answer is:
emend
'correct 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 by altering" , "Improve by editing" , "Alter something written to correct errors" , "Improve (writing)" , "Edit; make alterations to a draft" .)