Chief with Jaguar car, an original model (9)
I believe the answer is:
archetype
'an original model' is the definition.
(I've seen this before)
'chief with jaguar car' is the wordplay.
'chief' becomes 'arch' (synonyms).
'with' means one lot of letters go next to another.
'jaguar car' becomes 'E-Type' (sports car made by Jaguar).
'arch'+'etype'='ARCHETYPE'
(Other definitions for archetype that I've seen before include "Perfect example" , "They caper about like original model" , "Model - perfect specimen" , "Very characteristic example" , "Creepy hat (anag)" .)