Old mechanism in car's weird: scheme failing (10,5)

I believe the answer is:

archimedes' screw

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'old mechanism' is the definition.
The definition suggests a singular noun which matches the answer.

'car's weird scheme failing' is the wordplay.
'failing' indicates an anagram (a failed spelling of the word).
'cars'+'weird'+'scheme'='carsweirdscheme'
'carsweirdscheme' is an anagram of 'ARCHIMEDES' SCREW'.

'in' acts as a link.

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I've seen this clue in The Telegraph.

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