Throw away about 50% of what's used for training and education? (9)
I believe the answer is:
schooling
'education?' is the definition.
(I know that schooling is a type of education)
I cannot understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for schooling that I've seen before include "Instructing" , "support for education" , "Training" , "Education, for 10 across" , "lessons" .)