Capital of Japan (5)

I think it could be either:

Which length description are you looking for?:

tokyo

'capital of japan' is the definition.
(I know that Japan is a capital of of Tokyo)

This is all the clue.

(Other definitions for tokyo that I've seen before include "Large Japanese city" , "City once called Edo" , "Edo's modern name" , "Far Eastern capital" , "This covers an Asian city" .)

I've seen this clue in The Mirror and The Times.

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