They contain explosive sausages (7)
I believe the answer is:
bangers
'sausages' is the definition.
(banger can mean a sausage)
I don't understand the rest of the clue.
Can you help me to learn more?
(Other definitions for bangers that I've seen before include "Loud fireworks" , "Crates" , "Sausages" , "explosives?" .)