Passing over the purpose of Chambers! (8)

I believe the answer is:

forgoing

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'passing' is the definition.
The answer and definition can be both acts as well as being singular nouns.
Maybe you can see an association between them that I don't see?

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

Can you help me to learn more?

(Another definition for forgoing that I've seen is " Giving up (something desirable)".)

I've seen this clue in The Times and The Sunday Times.

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