The car doesn't have its brake on (5)

I believe the answer is:

rolls

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'the car' is the definition.
(short for Rolls Royce)

I can't explain the rest of the clue.

(Other definitions for rolls that I've seen before include "Bread portions" , "Overturns -- luxury car" , "breakfast food" , "flash car" , "Luxury car - lists of names" .)

I've seen this clue in the Evening Standard.

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