Bit of a yarn about football is close to the bone (8)
I believe the answer is:
'bone' is the definition.
I cannot understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for ligament that I've seen before include "Fibrous tissue joining bones or cartilage", "it's the physical bond", "Tough, bone-linking tissue", "Tough fibrous tissue in the body", "What footballer may damage".)