Carriage components reset anew after slewing wildly (12)

I believe the answer is:

swingletrees

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'carriage components' is the definition.
I don't know anything about this answer so I can't tell whether this works.

'reset anew after slewing wildly' is the wordplay.
I cannot quite see how this works, but
an anagram of 'reset' is 'trees' which is within the answer.
an anagram of 'slewing' is 'swingle' which is located in the answer.
This accounts for all the letters.
This explanation may well be incorrect...

Can you help me to learn more?

I've seen this clue in The Telegraph.

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