Not necessarily a film that arouses the emotions (6,7)

I believe the answer is:

moving picture

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'arouses the emotions' is the definition.
I can't judge whether this defines the answer.

'not necessarily a film' is the wordplay.
'not necessarily' becomes 'moving' (I can't explain this - if you can you should believe this answer much more).
'a film' becomes 'picture' ('picture' can be a synonym of 'film').
'moving'+'picture'='MOVING PICTURE'

'that' is the link.

Can you help me to learn more?

I've seen this clue in The Irish News.

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