What does the cryptic crossword clue "Peculiarity disguised by wise nerds (9)" mean?

The definition is "Peculiarity". The wordplay uses an anagram. anagram of WISE NERDS = WEIRDNESS The answer is WEIRDNESS.

Peculiarity disguised by wise nerds (9)

Independent Cryptic #11668 | 13 Across | 2024-03-04 flower