Possible Clues:

• Inter (anag.)
• That's what is so lousy about what's in gunpowder
• Take off the top and have it about in gunpowder
• Fertiliser can upside down and touching
• I rent what's in the gunpowder
• Chemical found in some older tins recalled
• Fool about, seeing gunpowder ingredient
• Saltpeter (Var.)
• Egg on soldiers making gunpowder ingredient
• Explosive container brought around by engineers