Jazz great's nickname (7)
I believe the answer is:
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">jazz great's nickname</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 satchmo that I've seen before include "Name used by jazz player Louis Armstrong" , "trumpeter" , "Louis Armstrong's nickname" , "Jazz musician" , "Louis Armstrong's byname" .)