Royal house youth flips lid (7)

I believe the answer is:

windsor

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'royal house' is the definition.
(Windsor is an example)

I cannot understand how the rest of the clue works.

(Other definitions for windsor that I've seen before include "former German house?" , "Royal castle; a tie knot" , "Weekend residence of the British royal family" , "town near Eton" , "somewhere in Berkshire" .)

I've seen this clue in the Sydney Morning Herald.

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