Jenkins known as "The First Lady of Children's Music" (4)

I believe the answer is:

ella

(Other definitions for ella that I've seen before include "Great late jazz singer . . . . Fitzgerald" , ".... Fitzgerald, late great jazz diva" , "- Wheeler Wilcox, US poet" , "Miss" , "Ms Fitzgerald" .)

I've seen this clue in The New York Times.

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