Support car marque as an original design (9)
I believe the answer is:
archetype
'an original design' is the definition.
(an original or basic design)
'support car marque' is the wordplay.
'support' becomes 'arch'.
'car marque' becomes 'E-type' (marque of Jaguar car).
'arch'+'etype'='ARCHETYPE'
'as' acts as a link.
(Other definitions for archetype that I've seen before include "Original model from which others are copied" , "Perfect example" , "Model - perfect specimen" , "Creepy hat (anag)" , "exemplary item)" .)