Simple changes in historic document with multiple texts (10)
I believe the answer is:
palimpsest
'document with multiple texts' is the definition.
'palimpsest' can be an answer for 'document' (I have seen 'recycled document' mean 'palimpsest' so perhaps 'document' could also mean 'palimpsest'). I'm unsure of the 'with multiple texts' bit.
'simple changes in historic' is the wordplay.
'changes' is an anagram indicator.
'in' is an insertion indicator.
'historic' becomes 'past' ('past' can be similar in meaning to 'historic').
'simple' is an anagram of 'limpse'.
'limpse' put within 'past' is 'PALIMPSEST'.
(Other definitions for palimpsest that I've seen before include "recycled document" , "Reused parchment" , "Recycled manuscript" , "Simple taps (anag.); a manuscript" .)