Japanese city known as The Nation's Kitchen (5)
I believe the answer is:
osaka
'japanese city known as the nation's kitchen' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for osaka that I've seen before include "Port city on Honshu, Japan" , "Asian" , "Japanese port, on Honshu" , "Japanese port city" , "Third most populous Japanese city" .)