He is bound to learn his craft (10)
I believe the answer is:
apprentice
'bound to learn his craft' is the definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.
'he' is the wordplay.
I cannot really see how this works, but
'he' could be 'prentice' and 'prentice' is present in the answer.
This may be the basis of the clue (or it may be nonsense).
'is' acts as a link.
Can you help me to learn more?
(Other definitions for apprentice that I've seen before include "new worker" , "student" , "Learner" , "Novice" , "Trainee" .)