Party extremes introduce it. Shame! (4)

I believe the answer is:

pity

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'shame' is the definition.
(I know that shame can be written as pity)

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

Can you help me to learn more?

(Other definitions for pity that I've seen before include "Sympathy for the suffering of another" , "Matter for regret" , "Feel sorrow for" , "Ruth" , "Cause of disappointment" .)

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

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