Possible Clues:

• That's a first-rate piece up in the leg
• It gives one a leg to stand on
• Bone connecting the knee to the ankle
• Femur-foot link
• Having returned in fine fettle, was chewing on a bone
• Bone in osso bucco, prime piece sent back
• A one piece up in the leg
• Bone, first-class piece put back
• It's found above the ankle
• Ancient pipe made of bone