Crossword Genius

Inferior schooling excludes child (4)

Ross

I believe the answer is:

less

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'inferior' is the definition.
(similar in meaning)

I don't understand how the remainder of the clue works.

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(Other definitions for less that I've seen before include "See 12" , "Fewer in number" , "In smaller quantity" , "Minus; not so much" , "inferior" .)

I've seen this clue in The Independent.
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