Car of your dreams? (7)

I believe the answer is:

sleeper

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'car' is the definition.
(I know that sleeper is a type of carriage)

I can't explain the remainder of the clue.

(Other definitions for sleeper that I've seen before include "Railway tie" , "Spy; part of railway" , "Inactive spy" , "Beam across railway track or berth on ship" , "film not successful at first" .)

I've seen this clue in The Sun.

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