What does the cryptic crossword clue "Extremely pretty teacher, astonishingly original (9)" mean?

The definition is "original". The wordplay uses an anagram. anagram of PY TEACHER = ARCHETYPE; definition: "original" The answer is ARCHETYPE.

Extremely pretty teacher, astonishingly original (9)

Times Cryptic #28713 | 14 Across | 2023-09-20 flower