Mother wants her boy to be a craftsman (5)
I believe the answer is:
mason
'a craftsman' is the definition.
(mason is a kind of craftsman)
'mother wants her boy' is the wordplay.
I cannot quite understand how this works, but
'mother' could be 'ma' (Ma is another word for mother or mum) and 'ma' is present in the answer.
'boy' could be 'son' (synonyms) and 'son' is found in the answer.
No letters remain.
This may be the basis of the clue (or it may be nonsense).
'to be' acts as a link.
Can you help me to learn more?
(Other definitions for mason that I've seen before include "US comedian" , "A worker in stone - may be free" , "One works with stone or brick" , "Craftsperson who works with stone or brick" , "one in construction" .)