Crossword Genius

Jolt in car that's jumped without starting (5)

Ross

I believe the answer is:

prang

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'jolt' is the definition.
Both the answer and definition are singular nouns.
Maybe there's an association between them I don't understand?

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for prang that I've seen before include "damage" , "Bomb attack" , "Crash (slang)" , "nasty collision" , "knock" .)

I've seen this clue in The Independent.
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