Old Nick related to bones (6)
I believe the answer is:
osteal
'related to bones' is the definition.
I can't tell whether this definition defines the answer.
'old nick' is the wordplay.
'old' becomes 'o' (common abbreviation eg in OE for Old English).
'nick' becomes 'steal' (nick can informally mean to steal).
'o'+'steal'='OSTEAL'
Can you help me to learn more?
(Other definitions for osteal that I've seen before include "skeleton may be thus described" , "made of bone" , "Bony" , "Relating to bone - so late (anag)" , "of bones" .)