Sparkling headwear (5)
I believe the answer is:
tiara
'sparkling headwear' 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 "special headgear" , "Jewelled head wear" , "Top decoration" , "Women's head ornament" , "Decorative headgear" .)