Musical John (5)
I believe the answer is:
elton
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">musical john</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for elton that I've seen before include "..... Jonn (musician)" , "First name of singer/songwriter born Reginald Dwight in 1947" , "Ben --; -- John" , ". . . . . John (musician)" , "Sir - - John, singer songwriter" .)