Pope's triple crown (5)

I believe the answer is:

tiara

'pope's triple crown' is the definition.
(I've seen this before)

This is the entire clue.

(Other definitions for tiara that I've seen before include "Half-crown?" , "Decorative headgear" , "Decorative headband" , "special headgear" , "Crescent-shaped headdrsss or Pope's diadem" .)

I've seen this clue in The Guardian.

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