Paper thrown at wedding (8)
I believe the answer is:
confetti
'paper thrown at wedding' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for confetti that I've seen before include "Scraps of coloured paper thrown in celebration" , "Paper rained on newlyweds" , "Paper pieces thrown at wedding" , "Pieces of coloured paper thrown at weddings" , "cast only for union celebration" .)