Ridley —, Best Director Oscar nominee for Thelma & Louise, Gladiator and Black Hawk Down (5)
I believe the answer is:
scott
(Other definitions for scott that I've seen before include "Sir Walter --, writer" , "Ivanhoe's creator" , "Sir Walter -, author of Guy Mannering" , "Polar explorer" , "Sir Peter -----, ornithologist son of a great explorer" .)