Boss enforcing a speed limit (8)

I believe the answer is:

governor

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'boss' is the definition.
(governor can mean someone's boss)

I can't explain the remainder of the clue.

(Other definitions for governor that I've seen before include "Head of an American state" , "Official in charge of prison" , "US state head" , "Official in charge of town/region" , "Chief, boss" .)

I've seen this clue in the Evening Standard.

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