The outer and thinner of the two bones between the knee and ankle of the leg (6)
![Ross](/clue/static/ross-mug.min.png)
I believe the answer is:
fibula
(Other definitions for fibula that I've seen before include "Outer bone in the calf" , "A lower-leg bone" , "Bone of the lower leg" , "Human leg-bone" .)
I've seen this clue in The Independent.
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