Choice to miss end of film (4,4)
I believe the answer is:
free will
'choice' is the definition.
(ability to make choices)
'to miss end of film' is the wordplay.
'to miss end of' means to remove the last letter.
'film' becomes 'Free Willy' (1994 film).
'freewilly' with its last letter removed is 'FREE-WILL'.
(Other definitions for free will that I've seen before include "The power of choosing own course of action" , "Unrestricted choice" , "discretion" , "The ability to choose" , "The power of determining one's own actions" .)