Related Clues:

• Better clues?
• Do post-production work
• Work on proofs, say
• Emulate Maxwell Perkins
• Correct copy
• Mark one's words, in a way
• Add to the staff?
• Correct errata
• Jot in a journal
• Change, as text
• Rewrite a bit
• Write, as music
• Work cutting words
• Use a 21-Across, e.g.
• Fix some paragraphs