Related Clues:

• Bitter
• See 17-Down
• Mordant
• Rock variety
• Alternative to mushrooms
• Kind of wit or test
• See 26-Down
• Stinging
• Milk of magnesia target
• Sarcastic
• Tummy troublers
• Niacin and vitamin C
• Digestion aid
• Ascorbic ___
• More than sarcastic