Vehicle kaput, rear end knocked off (3)

I believe the answer is:

bus

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'vehicle' is the definition.
(public transport vehicle)

I don't understand the remainder of the clue.

(Other definitions for bus that I've seen before include "Use transport" , "Means of public transport" , "eg Double-decker" , "Large passenger vehicle - small business!" , "Road vehicle able to carry many passengers" .)

I've seen this clue in The Times.

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