Christopher —, actor who played Dr Emmett L Brown in the Back to the Future film series (5)
I believe the answer is:
lloyd
(Other definitions for lloyd that I've seen before include "Harold - - , silent comic" , "David -- George, PM 1916-22" , "Marie -, nineteenth to twentieth century English music-hall entertainer" , "Christopher - - , garden expert" , "David - George, British PM nineteen sixteen to nineteen twenty two" .)