What does the cryptic crossword clue "High-flier with interest in school fostered by governess (4)" mean?

The definition is "High-flier with interest in school". The wordplay uses a hidden word. hidden in (fostered by) govERNEss. The answer is ERNE.

High-flier with interest in school fostered by governess (4)

Times Cryptic #29195 | 15 Across | 2025-04-04 flower