Possible Clues:

• Gastropod on a brasserie menu
• Hardly fast food: set out to eat a load
• English mark achieved for French food
• Menu mollusk
• One who made slow progress in French course?
• Got scare from edible French snail
• Edible snail (from Fr.)
• Delicacy often prepared à la Bourguignonne
• A dish of cooked land snails
• No fast food for French gourmet