Warren —, actor who played the title role in 1973 biopic Dillinger (5)
I believe the answer is:
oates
(Other definitions for oates that I've seen before include "sacrifice" , "His last words were I'm just going outside, and may be some time" , "Popish Plot perjurer" , "Antarctic explorer" , "One of Captain Scott's doomed 1912 South Pole team" .)