These film presenters are in fact medicine mass-providers (7)

I believe the answer is:

cinemas

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'these film presenters are' is the definition.
The definition suggests an adverb but the answer is not.

'fact medicine mass-providers' is the wordplay.
'CINEMAS' is hidden in amongst the letters.
However, I'm not sure how this is indicated.

'in' acts as a link.

Can you help me to learn more?

(Other definitions for cinemas that I've seen before include "Picture-houses" , "Where films are shown" .)

I've seen this clue in the Sydney Morning Herald.

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