Platinum Jubilee Barbie headgear (5)

I believe the answer is:

tiara

(Other definitions for tiara that I've seen before include "Crescent-shaped headdrsss or Pope's diadem" , "expensive headwear" , "Great delight" , "Women's head ornament" , "Type of diadem" .)

I've seen this clue in the Newsday.

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