Put information into code in French vault (7)
I believe the answer is:
encrypt
'put information into code' is the definition.
'in french vault' is the wordplay.
'in french' becomes 'en' ('en' can be French for 'in' e.g. en France).
'vault' becomes 'crypt' (I've seen this before).
'en'+'crypt'='ENCRYPT'
(Other definitions for encrypt that I've seen before include "Put (a message) into code" , "Cipher" , "Encipher" , "Convert words into code" , "disguise for security" .)