Kind of wedding (which goes off with a bang?) (7)
![Ross](/clue/static/ross-mug.min.png)
I believe the answer is:
shotgun
(Other definitions for shotgun that I've seen before include "piece" , "Firearm used at short range - kind of wedding" , "Hunting firearm" , "Type of wedding - weapon" , "No thugs (anag) - weapon" .)