Crossword Genius

During safest lap, surprisingly, vehicle at the back crashed out (4)

Ross

I believe the answer is:

fast

I'm a little stuck...
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Here is my best explanation:

'out' is the definition.
The answer and definition can be both acts as well as being singular nouns.
Perhaps you can see an association between them that I can't see?

I can't explain the remainder of the clue.

Ross

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This clue was last seen in The Guardian

(Other definitions for fast that I've seen before include "Speedy", "Of clock, ahead of correct time", "sort of convenience food", "Quick - don't eat", "Rapidly; tight", "Starve; quick", "Moored - fleet", "Quick - stop eating", "Unable to move" and "firm to > go without".)

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