Trashing contents of Petit Trianon, mean European princess (5,10)

I believe the answer is:

marie antoinette

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'princess' is the definition.
Both the answer and definition are singular nouns.
Maybe there's an association between them I don't understand?

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for marie antoinette that I've seen before include "unpopular queen" , "She lost her head" , "Queen, guillotined in 1793" , "French queen, d.1793" .)

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