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Thomas has commented that this one seems hard. I think this is because some of the wordplay assumes that you have the answer already.
I'd be glad of help with my last two:

Jumped-up porn baron in decline?
S ? N ? I ? G

Cultural reception begins late
A ? T ?

Sin King

Sin + King
(P)arty

(P)arty

Thank you scorpiojo and ginge. But why "jumped-up"?

Promotion of both porn => sin & Baron > King.

Thank you ginge. An illustration of the setter's over cleverness!