Possible Clues:

• Turkey isn't one
• Beef, lamb or mutton before cooking
• Soviet team cooked protein-rich food
• Vegetarian's no-no (2 words)
• Beef, perhaps, is food for radical?
• Vegan's no-no
• Embarrassed maiden has to consume non-vegetarian food
• Lamb, e.g
• What's your beef?
• Eg, beef