One going over and condensing (9)

I believe the answer is:

abridging

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'one going' is the definition.
The definition and answer can be both related to change as well as being present participle verbs.
Maybe there's an association between them I don't understand?

I don't understand the remainder of the clue.

Can you help me to learn more?

(Another definition for abridging that I've seen is " Shortening".)

I've seen this clue in the Sydney Morning Herald.

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