Ivy with a tradition of throwing toast (4)

I believe the answer is:

penn

(Other definitions for penn that I've seen before include "Milk actor" , "William ---, Quaker colonist" , "William --, founder of a US state" , "Early Quaker leader" , "US state (abbrev.)" .)

I've seen this clue in the Universal.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.