Clapton of rock (4)
I believe the answer is:
eric
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">clapton of rock</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for eric that I've seen before include "Blair, perhaps" , "Cantona or Clapton?" , "Ancient blood-money; Ernie's partner" , ".... the Red, Norwegian explorer who discovered Greenland in 10th century" , "---- Roberts, actor brother of Julia" .)