Possible Clues:

• Showing great strength
• Requiring superhuman effort
• Agatha's man linked to article of extraordinary power
• Powerful explosive with nuclear bomb
• Monumental (task)
• A guy starts a nuclear explosion that's mythically formidable
• Copper pursuing woman’s slender and very strong
• Woman’s not spotted saving uniform for such labours?
• The female copper -- thin or big and strong?
• Almost impossible, as a task