What does the cryptic crossword clue "Member of school ignoring head and going wrong (6)" mean?

The definition is "wrong". The wordplay uses a deletion. ERRING (deletion) = ERRING; definition: "wrong" The answer is ERRING.

Member of school ignoring head and going wrong (6)

Guardian Cryptic #29463 | 25 Across | 2024-08-16 flower