What the whistleblower is capable of is informing (12)

I believe the answer is:

denunciation

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'informing' is the definition.
The answer and definition can be both related to communication as well as being singular nouns.
Perhaps you can see an association between them that I can't see?

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

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(Another definition for denunciation that I've seen is " Strong public criticism".)

I've seen this clue in the Irish Times and the Irish Times (Crosaire).

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