Does it disfigure the back of the car? (7)

I believe the answer is:

spoiler

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'car?' is the definition.
The answer and definition can be both man-made objects as well as being singular nouns.
Maybe they are linked in a way I don't understand?

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

Can you help me to learn more?

(Other definitions for spoiler that I've seen before include "Device increasing drag" , "Aerodynamic surface on car" , "Disruptive competitor" , "part of wing" , "Plot disclosure" .)

I've seen this clue in the Evening Standard.

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