Edited parchment, most faded: wicked things therein (10)

I believe the answer is:

palimpsest

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'edited parchment' is the definition.
'palimpsest' can be an answer for 'parchment' (thesaurus). I'm not sure about the 'edited' bit.

I don't understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for palimpsest that I've seen before include "Simple taps (anag.); a manuscript" , "Recycled manuscript" , "Reused parchment" , "recycled document" .)

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