Now taking a spin in the runabout that’s new (6)

I believe the answer is:

unworn

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

'new' is the definition.
('unworn' can be similar in meaning to 'new')

'now taking a spin in the runabout' is the wordplay.
I cannot really understand how this works, but
an anagram of 'now' is 'nwo' which is within the answer.
The remaining letters 'urn' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...

'that's' is the link.

Can you help me to learn more?

I've seen this clue in the Evening Standard.

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