Papal topper (5)
![Ross](/clue/static/ross-mug.min.png)
I believe the answer is:
tiara
'papal topper' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for tiara that I've seen before include "Jewelled headpiece" , "Jewelled head wear" , "Jewelled hair-band" , "Half a crown!" , "Ornamental head gear" .)