Possible Clues:

• Conspiring chap few ask for change?
• Would-be regicide, chap goes two ways in speech
• Chap soundly digs his plot, he's remembered today
• Tease pirates going about with conspirator
• Chap pretends to embrace wife's effigy
• Gunpowder Plot planner of 1605
• Stay a week held in irons? That will do for conspirator
• English plotter against James I, remembered on 5 November
• His effigy is burned on Nov 5th in England