They provide the opposite to outgoings (7)

I believe the answer is:

incomes

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'they' is the definition.
Both the definition and answer are plural nouns.
Maybe there's a link between them I don't understand?

I can't explain the remainder of the clue.

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(Another definition for incomes that I've seen is " Revenues, salaries".)

I've seen this clue in The Irish Independent.

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