Wild party? I will crack that code (7)
I believe the answer is:
bushido
'that code' is the definition.
(I have seen 'honourable code' mean 'bushido' so perhaps 'code' could also mean 'bushido')
'wild party? i will crack' is the wordplay.
'wild' becomes 'bush' (bush is a kind of wild).
'party?' becomes 'do' (do is a kind of party).
'will crack' indicates putting letters inside (inserted letters go into a gap or crack).
'bush'+'do'='bushdo'
'bushdo' enclosing 'i' is 'BUSHIDO'.
(Other definitions for bushido that I've seen before include "Japanese code of chivalry" , "Strict ethical code of Japanese samurai" , "honourable code" , "code out east" , "Code of the Japense Samurai" .)