What does the cryptic crossword clue "Ninety previous slips in educational institution (4,10)" mean?

This cryptic clue uses wordplay to arrive at the answer. Visit the page for progressive hints — definition, wordplay type, and a full step-by-step explanation.

Ninety previous slips in educational institution (4,10)

Daily Mail Cryptic #17287 | 6 Across | 2024-02-06 flower

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