Crossword Genius

Environmental activist Thunberg (5)

Ross

I believe the answer is:

(Other definitions for greta that I've seen before include ".....Garbo, who wanted to be alone" , "Girl" , "'I want to be alone' - ?.. Garbo (5)" , "Female" , "lady" .)

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