Author copied - not fabricated - souvenir (7)
I believe the answer is:
memento
'souvenir' is the definition.
(I know that souvenir can be written as memento)
'author copied not fabricated' is the wordplay.
'author' becomes 'me' (the author of the crossword).
'copied' shows that letters should be duplicated.
'fabricated' is an anagram indicator.
'me' doubled is 'meme'.
'not' anagrammed gives 'nto'.
'meme'+'nto'='MEMENTO'
(Other definitions for memento that I've seen before include "might be kept for sentimental reasons" , "This reminds" , "Souvenir, reminder of past events" , "Souvenir, reminder of past event" , "Reminder that death is inevitable" .)