Trouble when overlooking the fourth estate? (3)

I believe the answer is:

car

'estate?' is the definition.
(estate is a type of car)

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

(Other definitions for car that I've seen before include "Hatchback, say?" , "Conveyance" , "Motor vehicle" , "4-wheeled vehicle" , "Automobile" .)

I've seen this clue in The Times.

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