Souvenir same in France, not fantastic (7)
I believe the answer is:
memento
'souvenir' is the definition.
(I know that souvenir can be written as memento)
'same in france not fantastic' is the wordplay.
'same in france' becomes 'meme' (I've seen this in another clue).
'fantastic' indicates anagramming the letters (a fantastic or improbable ordering of the letters).
'not' with letters rearranged gives 'nto'.
'meme'+'nto'='MEMENTO'
(Other definitions for memento that I've seen before include "Souvenir, reminder of past events" , "Reminder of a person or event" , "Keepsake or souvenir" , "Reminder that death is inevitable" , "trophy" .)