What's finally making a Parisian shoot criminal (9)
I believe the answer is:
gunrunner
'criminal' is the definition.
(I know that gunrunner is a type of smuggler)
'what's finally making a parisian shoot' is the wordplay.
'what's finally' suggests the final letters.
'a parisian' becomes 'un' ('a' in French).
'shoot' becomes 'runner' (plant shoot that goes along the ground).
The final letter of 'making' is 'g'.
'g'+'un'+'runner'='GUNRUNNER'
(Other definitions for gunrunner that I've seen before include "one secretly moves pieces?" , "Illegal arms dealer" , "one who moves arms impermissibly" , "Arms smuggler" .)