Reliable course to produce music for film (10)

I believe the answer is:

soundtrack

I'm a little stuck... Click here to teach me more about this clue!

'produce music for film' is the definition.
I can't judge whether this definition defines the answer.

'reliable course' is the wordplay.
'reliable' becomes 'sound' (I've seen this before).
'course' becomes 'track' (track is a kind of course**).
'sound'+'track'='SOUNDTRACK'

'to' acts as a link.

Can you help me to learn more?

(Other definitions for soundtrack that I've seen before include "Film's audio content" , "Audio recording of a film" , "film music" .)

I've seen this clue in The Independent.

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