Nice to be rid of incompetent leader after ten years resulting in social decay (9)

I believe the answer is:

decadence

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'decay' is the definition.
(I know that decay can be written as decadence)

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

Can you help me to learn more?

(Other definitions for decadence that I've seen before include "Perishing state" , "Moral or cultural decline" , "Degeneration" , "Corruption" , "Decline in quality" .)

I've seen this clue in The Hindu.

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