Vehicle meeting arch losing its front -- one may be charged (9)
I believe the answer is:
cartridge
'one may be charged' is the definition.
(as in a cartridge containing a charge for a gun)
'vehicle meeting arch losing its front' is the wordplay.
'vehicle' becomes 'cart' (cart is a kind of vehicle).
'meeting' says to put letters next to each other.
'arch' becomes 'bridge' (both can mean a curve).
'losing its front' means to remove the first letter.
'bridge' with its first letter taken away is 'ridge'.
'cart'+'ridge'='CARTRIDGE'
(Other definitions for cartridge that I've seen before include "Replaceable container of ink, etc." , "holds a lot of ink" , "shot put in it" , "Casing for charge and bullet" , "Shotgun ammunition" .)