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Scotsman nearly letting one rip? Could be notoriously radioactive! (9)

"Mac" additionally serves as indicating the Scottish use of "guff" - strictly speaking a Scottish word for an unpleasant smell (has been used for "fart") - I have used poetic license to extend it into a verb....
DBE refers to the radioactive orb in "Notorious".

'Nuff magic nonsense plot contrivance (9)

@ Geeker - 16/32 - ‘nuff said!

Sellers playing with this element of the plot may exemplify film gracefulness (9)

(sellers macguffin)* = (film gracefulness)*

A Chinese turn-up turns out to be a hidden clue (9)

A MING CUFF*

Last of audience exits shabby cinema screening rubbish character pursuit (9)

Beating Muffin (the Mule Marinières) initially guilty as charged, carries the story? (9)

Tweak @36

Last of audience exits shabby cinema screening garbage plot developer (9)

“Red herring? We don’t need no stinkin’ red herring to latch onto!” (9)

Touch of mayo is good in fast food breakfast, but ultimately, it serves no real purpose (8)

Mc(M)uffin --> Mc(g)uffin. Assuming the golden arches infest both shores.