Possible Clues:

• Rash kind of film that's cut by half
• Disease that's spread on the skin right away
• Long poem cut by half causes widespread ill-feeling
• Priest stopping religious festival before mice spread an outbreak of the plague?
• It's spread about that mice took a swim back east.
• Long account about the same classical disease
• Rash half contained by large-scale ...
• Complaint affecting many dancing mid-piece
• Plague is half the content of a poem
• Rampant male featured in piece I'd prepared