Deducing it’s proving satisfactory (7,3)

I believe the answer is:

working out

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'deducing' is the definition.
Although both the answer and definition are present participle verbs, I don't see how they can define each other.

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

Can you help me to learn more?

(Other definitions for working out that I've seen before include "proving fruitful?" , "exercise" , "Physical activity" , "Making sense of" .)

I've seen this clue in the Evening Standard.

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