Actor Sean ____ (4)
I believe the answer is:
penn
'actor sean' 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 "Colonising Quaker" , "Early Quaker leader" , "Milk actor" , "US state (abbrev.)" , "William ---, Quaker colonist" .)