Vehicle taking Oxbridge sportspeople regularly (3)

I believe the answer is:

bus

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

I cannot understand how the remainder of the clue works.

(Other definitions for bus that I've seen before include "Public transport vehicle" , "Public service vehicle" , "Something caught" , "Means of public transport" , "Mode of public transport" .)

I've seen this clue in The Times.

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