Sean —, Best Actor in a Leading Role Oscar winner for Milk and Mystic River (4)

I believe the answer is:

penn

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

I've seen this clue in The Mirror.

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