Related Clues:

• Heed gag about slang intellectual
• Ovoid-shaped intellectual?
• 'Vigour, vitality (6)'
• Ovoid-shaped intellectual
• Strength, vitality
• Can you force this to become greeny?
• One's likewise laid over the top
• Forceful enough to make Y green
• The force needed to make Y green?
• The force of a green Y?
• The way to get to the green Y by force
• can y get green with it?
• Likewise, one might easily be cracked
• The force that could make this a green Y
• Force Y to get green and make it (6)