With 68-Across, co-creator of the British parody band the Rutles (4)
I believe the answer is:
eric
(Other definitions for eric that I've seen before include "---- Roberts, actor brother of Julia" , "Cantona or Clapton?" , "- Sykes, British comedian" , "-- Sykes; -- Idle" , ".... the Red, Norwegian explorer who discovered Greenland in 10th century" .)