Possible Clues:

• If it's 31 across, layer it back
• Give the layer a turn-up for the living
• How the living layer turns up
• Only one mother from Ulster in half a hundred is so lively
• '20 Questions' category / Layer
• It shares the world with vegetable and mineral
• Brutal for a short time? Thats up to Capone
• In turn, the layer might become so lively
• Layer this up to make it live
• Overlooking American hostility to Capone, the brute