The most common and most likely answer to this crossword clue is the 7 letter word BUSHIDO
I've seen this crossword clue in The Daily Telegraph
B
U
S
H
I
D
O
More clues leading to the result BUSHIDO
- One enters wild land to produce chivalric code
- Part of Australia maybe with unusual language to convey code of honour
- President’s instinct at the end — no moral code
- It was honourable, for Japanese double-decker was open-top?
- I must enter wild region and produce chivalric code
- Samurai philosophy‘s romantic vow to support presidential dynasty
- Old president overseeing pledge of intended code of chivalry
- Warrior's code made a US President agree to a union
- President gets bride’s confirmation for martial law
- Dishonourable characters — no real code of honour in Japan
Buddy explains!

The straight part
We know that "code of chivalry" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case code of chivalry = bushido.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does BUSHIDO mean?
BUSHIDO noun- An ethical code of the samurai that was prevalent in feudal Japan that advocated unquestioning loyalty to the master at all costs and obedience in all deeds, valuing honor above life.