Replace second overturned vehicle (7)

I believe the answer is:

omnibus

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'vehicle' is the definition.
(I've seen this before)

I can't explain the remainder of the clue.

(Other definitions for omnibus that I've seen before include "traffic" , "collection of novels?" , "Collection of books reprinted in one volume" , "One can expect to be moved by this" , "Travelling" .)

I've seen this clue in The Everyman puzzle in The Observer.

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