Investigative journalist Tarbell (3)

I believe the answer is:

ida

(Other definitions for ida that I've seen before include "Princess in a Gilbert and Sullivan comic opera" , "Princess __ (G&S comic opera)" , "Stagey princess" , "Cretan mountain - Gilbert and Sullivan princess" , "Girl's name; aid (anag.)" .)

I've seen this clue in The New York Times and the USA Today.

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