Trained schoolmaster lacked the space to teach (9)
I believe the answer is:
classroom
'space to teach' is the definition.
I can't tell whether this defines the answer.
'trained schoolmaster lacked the' is the wordplay.
'trained' indicates anagramming the letters (train can mean to shape or manipulate).
'lacked' suggests deleting specific letters.
'schoolmaster' with 'the' taken away is 'scoolmasr'.
'scoolmasr' with letters rearranged gives 'CLASSROOM'.
Can you help me to learn more?
(Other definitions for classroom that I've seen before include "Teaching space" , "place of education" , "Teaching chamber" , "Where children learn" , "Where folk are taught" .)