Penchant for the final act (4,4)

I believe the answer is:

swan song

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'final act' is the definition.
(swan song can mean a final performance or act)

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for swan song that I've seen before include "Last performance of a career" , "last time out" , "Final performance, last hurrah" , "Last appearance" , "A dying performance" .)

I've seen this clue in The Guardian.

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