Human nature to dismiss anthem of The Republic in the Pacific Islands (5)

I believe the answer is:

nauru

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'human' is the definition.
Although both the answer and definition are singular nouns, I don't understand how one could define the other.

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for nauru that I've seen before include "[OCEANIA] location" , "little nation" , "Small Pacific republic" , "Pacific island country" , "Island country in Micronesia" .)

I've seen this clue in the Irish Times.

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