Inferior schooling excludes child (4)
I believe the answer is:
less
'inferior' is the definition.
(similar in meaning)
I don't understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for less that I've seen before include "See 12" , "Fewer in number" , "In smaller quantity" , "Minus; not so much" , "inferior" .)