Actor Wilson of "Wedding Crashers" (4)
I believe the answer is:
owen
(Other definitions for owen that I've seen before include "Welsh industrialist and social reformer, founder of cooperative communities, d. 1858" , "Wilfred - - , WW1 poet" , "Wilfred -, English poet killed in World War One" , "Welsh boy's name" , "'E won over the Welshman" .)