Fine the Parisian in vehicle (5)
I believe the answer is:
clear
'fine' is the definition.
(thesaurus)
'the parisian in vehicle' is the wordplay.
'the parisian' becomes 'le' (definite article in French).
'in' is an insertion indicator.
'vehicle' becomes 'car' (car is a kind of vehicle**).
'le' going within 'car' is 'CLEAR'.
(Other definitions for clear that I've seen before include "Free from blame" , "Distinct - obvious" , "Transparent or cloudless" , "Pellucid" , "Bold" .)