The most common and most likely answer to this crossword clue is the 9 letter word SCHOOLING
I've seen this crossword clue in The Guardian
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Buddy explains!
The straight part
We know that "education" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case education = schooling.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does SCHOOLING mean?
SCHOOLING verb- (of fish) To form into, or travel in a school.
- To educate, teach, or train (often, but not necessarily, in a school).
- To defeat emphatically, to teach an opponent a harsh lesson.
- To control, or compose, one's expression.
- Training or instruction.
- Institutional education; attendance of school.
- The training of a horse at dressage.
- Discipline; reproof; reprimand.
- Compensation for instruction; price or reward paid to an instructor for teaching pupils.