Screen publicity for mobile housing (7)

I believe the answer is:

trailer

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

'screen publicity' is the definition.
'trailer' can be an answer for 'publicity' (I have seen 'Advance publicity' mean 'trailer' so perhaps 'publicity' could also mean 'trailer'). I'm not certain of the 'screen' bit.

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for trailer that I've seen before include "Movie promotion" , "Picture" , "TV ad" , "Creeping plant" , "It's pulled by a vehicle" .)

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

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