What does the cryptic crossword clue "Need oar to do exercise in public school (7)" mean?

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

Need oar to do exercise in public school (7)

Independent Cryptic #11726 | 22 Across | 2024-05-10 flower