Papal headgear (5)
I believe the answer is:
tiara
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">papal headgear</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for tiara that I've seen before include "Woman's headdress for very formal occasions" , "Women's head ornament" , "it goes to one's head!" , "Jewelled crescent-shaped headdress" , "Jewelled head-ornament" .)