Related Clues:

• It's slapstick material
• Battery liquid
• After-dinner fare
• 'American ___'
• In a sour mood
• 'National Velvet' horse
• Amino attachment
• Type of test
• Like dogbane juice
• Corrosive stuff
• Etcher's fluid
• Like a sourball
• Word with sweetie or cutie
• Bird food
• It was dropped in the '60s