Vehicle requiring internal upkeep essentially shuddered (6)

I believe the answer is:

quaked

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

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

(Other definitions for quaked that I've seen before include "Shook" , "Quivered, trembled" , "Shivered in one's shoes" .)

I've seen this clue in The Independent.

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