Band of tissue joining bones (8)
I believe the answer is:
ligament
'band of tissue joining bones' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for ligament that I've seen before include "Band of tissue joining bones" , "What footballer may damage" , "Tough fibrous tissue in the body" , "Tissue joining bones or cartilages" , "it's the physical bond" .)