Crossword Genius

Petitions involving legal affairs, by island, Indonesian one (8)

Ross

I believe the answer is:

sulawesi

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'one' is the definition.
Both the definition and answer are singular nouns.
Perhaps there's an association between them I don't understand?

I cannot understand how the remainder of the clue works.

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(Another definition for sulawesi that I've seen is " Indonesian island".)

I've seen this clue in The Times.
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