Muckraker Tarbell (3)
I believe the answer is:
ida
'muckraker tarbell' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for ida that I've seen before include "Cretan mount" , "Cretan mountain - Gilbert and Sullivan princess" , "Industry development group" , "Classic mount" , "- Rubinstein, Russian dancer, actress" .)