Curious type using hooter when leaving car? (5,6)

I believe the answer is:

nosey parker

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'curious type' is the definition.
(informal term for an overly curious person)

I can't explain the rest of the clue.

(Other definitions for nosey parker that I've seen before include "Excessively inquisitive person" , "Overly inquisitive person" , "Prying busybody" , "One who wants to know" .)

I've seen this clue in The Times.

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