Christmas tree trim (6)
I believe the answer is:
tinsel
'christmas tree trim' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for tinsel that I've seen before include "superficially attractive" , "Sparkly decoration" , "Gaudy decoration" , "Glittering metallic substance in strips or threads" , "Sparkly strands" .)