Can rave and lose footing in a trailer (7)

I believe the answer is:

caravan

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'trailer' is the definition.
(caravan is a kind of trailer)

I can't explain the remainder of the clue.

(Other definitions for caravan that I've seen before include "Towed vehicle" , "Group crossing a desert" , "Camel train" , "Home on wheels" , "Trailer with living quarters" .)

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

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