Possible Clues:

• Aquaman's weapon
• Big name in chewing gum
• Weapon tip off demanding attention
• Weapon made of explosive containing free energy
• Form of identification carried by engineers probing explosive missile
• Old or modern weapon I'd found in river
• Satan's accessory
• A centre of primitive processes in river that's associated with Neptune
• Journey covered by explosive missile
• Explosive to be borne inside missile