Indifference when Japan banned outsiders, and they banned euro (6)

I believe the answer is:

apathy

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'indifference' is the definition.
(I know that indifference can be written as apathy)

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for apathy that I've seen before include "Lack of emotion and interest" , "Flatness" , "Lack of excitement" , "Torpor" , "Detachment" .)

I've seen this clue in the Sydney Morning Herald.

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