Trooped off to see something exploding (7)
I believe the answer is:
torpedo
'something exploding' is the definition.
'trooped off' is the wordplay.
'off' indicates anagramming the letters.
'trooped' anagrammed gives 'TORPEDO'.
'to see' is the link.
(Other definitions for torpedo that I've seen before include "Naval missile" , "Explosive underwater projectile" , "Trooped off with underwater missile" , "Sea-borne missile" , "Anti-ship weapon" .)