Possible Clues:

• Manuscript where text has been written over earlier writing — sample tips (anag)
• Edited parchment most faded, wicked things in it
• Simple changes in historic document with multiple texts
• Nuisance admits a lack of energy at school producing reused manuscript
• Recycled paper from long ago
• Chum with misstep involved in a sort of cover-up
• Manuscript father misspelt badly
• Reused parchment; mass tipple (anag.)
• Reused parchment