Rich people assume current power; that's confidential information! (3-4)

I believe the answer is:

tip-offs

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'rich people' is the definition.
Although both the answer and definition are plural nouns, I can't understand how they can define each other.

I can't explain the remainder of the clue.

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(Other definitions for tip-offs that I've seen before include "suggestions" , "Strong hints" , "Hints, warnings" .)

I've seen this clue in The Guardian.

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