What does the cryptic crossword clue "Dare one to blow up school (7)" mean?

The definition is "school". The wordplay uses an anagram. anagram of DARE + ONE = ROEDEAN; definition: "school" The answer is ROEDEAN.

Dare one to blow up school (7)

Guardian Cryptic #29204 | 27 Across | 2023-10-18 flower