Crossword Genius

Fails miserably in poor vehicles (5)

Ross

I believe the answer is:

bombs

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'fails miserably' is the definition.
(I've seen this in another clue)

I don't understand the rest of the clue.

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(Other definitions for bombs that I've seen before include "Fails horribly" , "Shells" , "Explosive devices" , "Weapons" .)

I've seen this clue in the Sydney Morning Herald.
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