Dress spangle (6)
I believe the answer is:
sequin
'dress spangle' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for sequin that I've seen before include "that sparkles" , "possibly a gold disc" , "Sparkling disc on a dress" , "Shiny decoration for clothes" , "Small shiny disc for decoration" .)