Largest of the National Theatre's three stages (7)
I believe the answer is:
olivier
(Other definitions for olivier that I've seen before include "Noted actor" , "Sir Laurence, once a great British actor" , "O! Virile (anag) - English actor, d. 1989" , "English actor best known for his Shakespearean roles" , "He starred in classic films of Hamlet and Henry V" .)