Unsuccessful Attempt to Kill King James I: __ Plot
Puzzle 16 of Famous Philosophers Hard Pack
Question is: Unsuccessful Attempt to Kill King James I: __ Plot
and the answer is: GUNPOWDER
Word Meaning:
GUNPOWDER — An explosive mixture of saltpetre (potassium nitrate), charcoal and sulfur; formerly used in gunnery but now mostly used in fireworks.
Definitions from Wiktionary.