"Rocket Man" John (5)
I believe the answer is:
elton
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">rocket man 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 "Sir ___ John, singer-songwriter" , "- John, British singer" , "One John" , "Ben --; -- John" , ". . . . . John (musician)" .)