Might its driver give citizens advice? (3)

I believe the answer is:

cab

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'might' is the definition.
Although both the answer and definition are singular nouns, I can't see how one could define the other.

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for cab that I've seen before include "An American taxi" , "Hired car" , "A taxi in America" , "Driver's compartment, in lorry say" , "Driving compartment" .)

I've seen this clue in the Evening Standard.

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