Shiny decoration (6)
I believe the answer is:
tinsel
'shiny decoration' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for tinsel that I've seen before include "Sparkly decoration" , "Gaudy decoration" , "Glittering metal foil strip" , "Christmas foil" , "Cheap and gaudy metallic material" .)