Crossword Genius

Maybe a mini source of advice (3)

Ross

I believe the answer is:

cab

I'm a little stuck... Click here to teach me more about this clue!

'source of advice' is the definition.
(I've seen this in other clues)

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for cab that I've seen before include "Organisation to collect money made from crime" , "A taxi in New York" , "Hackney" , "Driver's compartment, in lorry say" , "An American taxi" .)

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