Possible Clues:

• The first to offer a tremendous example - self-sacrifice
• Conspirator in middle of road confirmed rising
• Bigger than usual crossing worried Antarctic explorer
• Hall & ___
• Doomed explorer, giving nothing to comrades, heading off
• Polar explorer — Stuart conspirator
• South Pole hero; Popish Plotter
• 'Them' novelist
• 'Angel of Light' novelist
• Titus —, English conspirator