Possible Clues:

• *Sauce in a boat
• Pulling power - find it in sauce
• Anatomist holding volume — it shows seriousness
• The importance of physical attraction
• What Newton understood with great seriousness
• Importance; a natural force
• That's what's so serious about The Fall
• So that's what caused the Fall? No joking!
• Seriousness with which wine is poured into sauce
• What's universally attractive, it appears, in ill-gotten gains