Diadem (5)
'diadem' 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 coronet" , "Jewelled headband" , "Ornamental headpiece" , "Ornamental head band" , "Women's head ornament" .)
'diadem' is the definition.
(I know that diadem can be written as crown)
This is the entire clue.
(Other definitions for crown that I've seen before include "Visible part of a tooth" , "Symbol of monarchy" , "Old coin; whack on head" , "Coronet" , "Monarch's headgear" .)