Muhammad --, boxer (3)
I believe the answer is:
ali
<span class="explanation-format__ClueExplanation">This clue is a double definition.<br/ ><br/ >'<span class="explanation-format__original">muhammad</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >'<span class="explanation-format__original">boxer</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(Muhammad Ali)</span><br/ ><br/ ></span>
(Other definitions for ali that I've seen before include "Muhammad ... (former fighter)" , "Muslim name" , "Old fighter" , "Champion of ring" , "Mohammad . . ., . . . Hewson" .)