Japanese ceremonial departure (4-4)
I believe the answer is:
hara-kiri
'japanese ceremonial departure' is the definition.
The definition suggests a singular noun which matches the answer.
This is the entire clue.
Can you help me to learn more?
(Other definitions for hara-kiri that I've seen before include "Suicide in traditional Japanese style" , "Traditional suicide in Japan" , "Japanese form of ritual suicide" , "Suicide as a matter of honour" , "Ritual suicide in Japan" .)