Dinky car, a true original (9)

I believe the answer is:

miniature

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'dinky' is the definition.
Both the definition and answer are adjectives. Perhaps there's an association between them I don't understand?

'car a true original' is the wordplay.
'car' becomes 'mini' (Mini Cooper).
'original' is an anagram indicator.
'a'+'true'='atrue'
'atrue' with letters rearranged gives 'ature'.
'mini'+'ature'='MINIATURE'

Can you help me to learn more?

(Other definitions for miniature that I've seen before include "Smaller than normal" , "Of a much smaller size than usual" , "Small-scale version" , "Diminutive" , "Little" .)

I've seen this clue in The Times.

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