Crossword Genius

Jalopies with inadequate suspension (11)

Ross

I believe the answer is:

boneshakers

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'jalopies' is the definition.
The answer and definition can be both man-made objects as well as being plural nouns.
Maybe they are linked in a way I don't understand?

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Another definition for boneshakers that I've seen is " Bicycles".)

I've seen this clue in The Times.
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