Create film music from scratch (5)
I believe the answer is:
score
I believe this is a double definition.
'create film music' is the first definition.
'scratch' is the second definition.
(score is a kind of scratch)
'from' is the link.
(Other definitions for score that I've seen before include "Points in a match" , "Notch; twenty" , "Result" , "purchase of illegal drugs" , "Mark; orchestrate" .)