Crossword Genius

Greta Thunberg's latest piece on carbon unconfined (5)

Ross

I believe the answer is:

garbo

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'greta' is the definition.
(Greta Garbo)

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for garbo that I've seen before include "Swedish-born actress" , "Famous film actress" , "Greta -, Swed. actress" , "film-star" , "Swedish actress born Greta Gustafsson" .)

I've seen this clue in The Telegraph.
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