Possible Clues:

• It's himself from Ireland, so it is, and an evil liver too
• It's a livery for Patrick himself, so it is
• The old man touching bird — he is catching that disease
• Patrick himself it is that's the evil liver
• omplaint about pie that is rotten
• 'Tis Patrick himself, so it is, and livery
• Disease that comes in types A, B, and C, most commonly
• It's himself, Patrick, so it is that's in livery trouble (9)
• Inflammation of liver — I hate pits (anag)
• Condition that can precede A, B, or C