The most common and most likely answer to this crossword clue is the 8 letter word SUKIYAKI
I've seen this crossword clue in Financial Times
S
U
K
I
Y
A
K
I
Buddy explains!
The straight part
We know that "dish in Japan" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case dish in japan = sukiyaki.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 SUKIYAKI mean?
SUKIYAKI noun- A Japanese dish of thinly-sliced beef and tofu with dashi, mirin and soy sauce cooked quickly at the table.