It's thrown at weddings (8)
I believe the answer is:
confetti
'it's thrown at weddings' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for confetti that I've seen before include "Pieces of coloured paper thrown at weddings" , "To infect (anag)" , "Paper pieces thrown at wedding" , "Scraps of coloured paper thrown in celebration" , "Celebratory paper at wedding" .)