Singer's articles from Buenos Aires (4)

I believe the answer is:

ella

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'singer's' is the definition.
(Ella Fitzgerald)

I can't explain the remainder of the clue.

(Other definitions for ella that I've seen before include "---- Fitzgerald, 'Queen of Jazz'" , "- - Fitzgerald (mus.)" , "Great late jazz singer . . . . Fitzgerald" , "Woman" , "Girl" .)

I've seen this clue in The Guardian.

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