Éclat mixed with verve in a car (9)
I believe the answer is:
cabriolet
'a car' is the definition.
(I've seen this before)
'eclat mixed with verve' is the wordplay.
'mixed' indicates an anagram.
'with' is an insertion indicator.
'verve' becomes 'brio' (I've seen this before).
'eclat' anagrammed gives 'calet'.
'calet' enclosing 'brio' is 'CABRIOLET'.
'in' acts as a link.
(Other definitions for cabriolet that I've seen before include "convertible" , "Car with a folding roof" , "Car with a folding top -- trace boil (anag)" , "vehicle" , "Soft-top car" .)