Crossword Genius

Keystone State eponym (4)

Ross

I believe the answer is:

penn

'keystone state eponym' is the definition.
(I've seen this in another clue)

This is the entire clue.

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

I've seen this clue in The New York Times.
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