Could you call one a mini? (3)

I believe the answer is:

cab

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I'm afraid I can't even guess how this answer relates to the clue.

(Other definitions for cab that I've seen before include "It has the authority to confiscate the proceeds of crime, in short" , "An American taxi" , "Hired car" , "info for citizens provided here" , "Transport" .)

I've seen this clue in the Evening Standard.

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