Possible Clues:

• Change me for the better in one of 13 down
• For a change this will finish after me up here
• Change this to make 'em die
• Correct texts
• Change, as text
• Blue-pencil
• Turn me at last and change me for the better
• Correct errata
• To alter a text is something tremendous
• Improve, chaps, when the paper's boss comes around