The street entertainer's vehicle (3)

I believe the answer is:

bus

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

I can't explain the remainder of the clue.

(Other definitions for bus that I've seen before include "People carrier" , "Of projectiles; (go) mad (slang)" , "Public service vehicle" , "Means of public transport" , "Road vehicle able to carry many passengers" .)

I've seen this clue in the Evening Standard.

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