A Busoni piece that may carry you away (3)

I believe the answer is:

bus

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'piece that may carry you away' is the definition.
The definition and answer can be both man-made objects as well as being singular nouns.
Maybe they are linked in a way I don't understand?

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for bus that I've seen before include "Means of public transport" , "Of projectiles; (go) mad (slang)" , "People carrier" , "Motor-coach" , "Public service vehicle" .)

I've seen this clue in the Evening Standard.

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