Related Clues:

• Hit for 1-Across
• Blowup source, perhaps
• See 1 Across
• Quarry compound
• Cause of smithereens, maybe
• Block buster?
• Blaster's stuff
• It blasts
• Palindromic exploder
• Demolition compound
• The great leveler
• Cause of a big blowup?
• Traffic jam sound
• Intrude, with ''in''
• Northwest Territories mountain range