I'm in a new car (4)

I believe the answer is:

mini

'car' is the definition.
(Mini Cooper)

'i'm in a new' is the wordplay.
'a new' indicates an anagram.
'im'+'in'='imin'
'imin' anagrammed gives 'MINI'.

(Other definitions for mini that I've seen before include "vehicle" , "type of garment" , "Car; short dress" , "Cult British car" , "Car designed by Issigonis" .)

I've seen this clue in The Globe and Mail.

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