Possible Clues:

• Steak throwaway
• Note Lister's damaged cartilage
• Joint said to be found in peculiar gel - an unwanted bit of meat
• Stir leg (anag.)
• Tough stuff in meat
• It's hard to eat corn before it's ground extremely little
• It is usually difficult to eat
• Stir leg to get tough tissue in meat
• It's tough for it to get ground over the French ( 7)
• Steak defect