Related Clues:

• Almost boiled
• Didn't quite boil
• Immersed, cooked and gently boiled
• Boiled gently
• Boiled with rage?
• Bubbled on a burner
• Computer game, uncomplicated: daughter was about to lose it?
• Kept just below a boil
• Kept on the down-low?
• Was close to an outburst of emotion