Car models, including carbon copies (7)
I believe the answer is:
ectypes
'copies' is the definition.
'car models including carbon' is the wordplay.
'car models' becomes 'etypes' (Jaguar E-Type).
'including' is an insertion indicator.
'carbon' becomes 'c' ('C' can be a synonym of 'carbon').
'etypes' enclosing 'c' is 'ECTYPES'.
I've seen this clue in The Guardian.
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