___ Armstrong, jazz musician (5)
I believe the answer is:
louis
<span class="explanation-format__ClueExplanation">I believe this is a double definition.<br/ ><br/ >'<span class="explanation-format__original">armstrong</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">jazz musician</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(I know that Louis is a jazz musician)</span><br/ ><br/ ></span>
(Other definitions for louis that I've seen before include "Many kings of France" , "-- Armstrong, trumpeter" , "French gold coin" , "French boy's name" , "Joe ---, the Brown Bomber" .)