Charlotte races about in this? (7,7)

I believe the answer is:

chelsea tractor

I'm a little stuck... Click here to teach me more about this clue!

'this?' is the definition.
I don't know anything about this answer so I can't judge whether it can be defined by this definition.

'charlotte races about' is the wordplay.
'about' indicates anagramming the letters.
'charlotte'+'races'='charlotteraces'
'charlotteraces' with letters rearranged gives 'CHELSEA TRACTOR'.

'in' is the link.

Can you help me to learn more?

(Another definition for chelsea tractor that I've seen is " Huge 4WD".)

I've seen this clue in The Guardian.

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