Possible Clues:

• Tibia
• The tibia
• Often-bumped part of the leg
• It's over a foot long in skeleton
• The less formal tibia
• It's hard to be over one foot for boshne, perhaps (4, 4)
• It's guarded in a soccer game
• It's vital for a member's standing
• It's no legend - it's just over one foot of one, but not on the surface
• It gets its kicks