Hear a rule detected by auditors (7)

I believe the answer is:

arraign

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'hear' is the definition.
The answer and definition can be both to do with social activities as well as being verbs in their base form.
Maybe there's an association between them I don't understand?

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

Can you help me to learn more?

(Other definitions for arraign that I've seen before include "Impeach" , "Accuse publicly" , "Act against" , "Call before court to answer criminal charge" , "Accuse of a wrong" .)

I've seen this clue in The Times.

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