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Dirty number in a movie (5)

Ross

I believe the answer is:

dozen

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

This clue could be a double definition.

'dirty number' is the first definition.
(I've seen this in another clue)

'a movie' is the second definition.
Although both the answer and definition are singular nouns, I don't understand how one could define the other.

'in' acts as a link.

Can you help me to learn more?

(Other definitions for dozen that I've seen before include "Set of 12" , "See 4" , "Twelfth of a gross" , "One less than 13" , "A small number" .)

I've seen this clue in the Evening Standard.
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