Conspiracy of 1605 (9,4)

I believe the answer is:

gunpowder plot

(Other definitions for gunpowder plot that I've seen before include "Thwarted conspiracy of 1605" , "Guy was actively involved in this" , "Guy Fawkes' conspiracy" , "1605 assassination attempt against James I" , "Guy's planning" .)

I've seen this clue in The Guardian.

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