What does the cryptic crossword clue "School has nothing certain to provide tranquillity (9)" mean?

The definition is "tranquillity". The wordplay uses a charade (building blocks). COMP (synonym="School") + O (abbreviation="nothing") + SURE (synonym="certain") = COMPOSURE; definition: "tranquillity" The answer is COMPOSURE.

School has nothing certain to provide tranquillity (9)

Guardian Cryptic #28262 | 25 Across | 2020-10-12 flower

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