Casually announced guide for driver? (9)

I believe the answer is:

chauffeur

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'for driver?' is the definition.
(chauffeur is a kind of driver)

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for chauffeur that I've seen before include "Driver for private car" , "Professional driver" , "One is paid to drive a car" , "Person employed to drive a car" , "One employed to drive a car for someone" .)

I've seen this clue in The Telegraph.

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