26 across
Film
society
hosted
by
Cambridge
University
(4)
Film society hosted by Cambridge University (4)
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The definition is at the beginning of the clue.
How the clue works
The definition is Film — a mist is a thin film of vapour. Now for the wordplay: take MIT, the university in Cambridge, Massachusetts, and have it "host" the abbreviation S for society, tucking it inside to give MI-S-T.