Ethiopian of opera (4)
I believe the answer is:
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">ethiopian of opera</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 aida that I've seen before include "slave of Covent Garden" , "title role" , "Operatic lady" , "Covent Garden production?" , "Fragrant shrub" .)