Bone, one attached to head, showing glossy quality (9)

'glossy quality' is the definition.
The answer and definition can be both human attributes as well as being singular nouns.
Maybe you can see a link between them that I can't see?

'bone one attached to head' is the wordplay.
I cannot quite see how this works, but
'bone' could be 'shin' (shin is a kind of bone) and 'shin' is found in the answer.
'one' could be 'i' (Roman numeral) and 'i' is present in the answer.
'head' could be 'ness' (ness is a headland) and 'ness' is found within the answer.
This accounts for all the letters.
This may be the basis of the clue (or it may be nonsense).

'showing' acts as a link.

Can you help me to learn more?