Lost test case taking a run in vehicles (6,4)

I believe the answer is:

estate cars

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

'vehicles' is the definition.
(estate car is a kind of vehicle)

I can't explain the rest of the clue.

(Another definition for estate cars that I've seen is " Vehicles".)

I've seen this clue in The Times.

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