2001 Christopher Nolan flick (7)
I believe the answer is:
memento
'2001 christopher nolan flick' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for memento that I've seen before include "Keepsake or souvenir" , "This reminds" , "might be kept for sentimental reasons" , "trophy" , "Reminder of a person or event" .)