Possible Clues:

• One prompting people to go green, for short?
• Patron of the Archdiocese of New York, briefly
• Figure associated with pinching on March 17, for short
• Reek Sunday honoree, familiarly
• VIP of a parade in March
• VIP of an annual parade
• Mar. figure
• March VIP, for short
• March 17 honoree, as well as this puzzle's honoree
• Patron toasted with green beer