Yankee caravan? One jeering behind it (7)

I believe the answer is:

trailer

(Other definitions for trailer that I've seen before include "Cinematic ad for forthcoming attraction - caravan (US)" , "Forthcoming film ad" , "commercial vehicle drawn along" , "Retrial (anag)" , "that's attached to back of vehicle" .)

I've seen this clue in The Times.

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