Bit of film shows caravan (7)
I believe the answer is:
trailer
This could be a double definition.
'bit of film shows' is the first definition.
The definition and answer can be both man-made objects as well as being singular nouns.
I also know that 'film' relates to this answer.
'caravan' is the second definition.
(I've seen this before)
Can you help me to learn more?
(Other definitions for trailer that I've seen before include "advertise film" , "One that's dragged along" , "one's dragged behind" , "vehicle without power" , "Cinematic ad for forthcoming attraction - caravan (US)" .)