Initially, brilliant animators make book into movie (5)
I believe the answer is:
bambi
'movie' is the definition.
(Bambi is a Disney film)
'initially brilliant animators make book into' is the wordplay.
'initially' suggests taking the first letters.
The first letters of 'brilliant animators make book into' is 'BAMBI'.
(Other definitions for bambi that I've seen before include "Walt Disney's lovable cartoon deer" , "Instrument found in 15" , "Disney character" , "Walt Disney's famous cartoon deer" , "7's fawn" .)