Former Japanese capital (5)

I think it could be either:

Which length description are you looking for?:

kyoto

'former japanese capital' is the definition.
(I've seen this before)

This is the entire clue.

(Other definitions for kyoto that I've seen before include "Tokyo (anag) - former capital of Japan" , "Japanese city of treaty on climate change" , "Japan's old capital" , "Former Japanese capital city - Tokyo (anag)" , "City of agreement on global warming" .)

I've seen this clue in The Guardian and the Newsday.

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