Favourable bias by a student of bones (6)
I believe the answer is:
spinal
'favourable bias by a student of bones' is the definition.
I can't tell whether this definition defines the answer.
'favourable bias by a student' is the wordplay.
'favourable bias' becomes 'spin' (I've seen this in another clue. I am not sure about the 'favourable' bit.).
'by' means one lot of letters go next to another.
'student' becomes 'L' (as in L-plates for learner drivers).
'spin'+'a'+'l'='SPINAL'
Can you help me to learn more?
(Other definitions for spinal that I've seen before include "Plains (anag.)" , "Of the vertebrae" , "Member of dock family with edible stems" , "Type of column" , "affecting the back?" .)