The most common and most likely answer to this crossword clue is the 7 letter word ROEDEAN
I've seen this crossword clue in The Guardian
R
O
E
D
E
A
N
More clues leading to the result ROEDEAN
- Girls’ school or, contrarily, area in paradise
- See maiden being put off by head of faculty in school
- Eggs on head of school — it’s not for boys
- School run by one heartless academic fellow
- School’s English Head of Faculty gets run out first
- What eight might do reportedly facing academic authority in school
- Read one novel in girls’ school
- Dictionary in study largely associated with northern school
- Academic establishment, near to decay, houses famous dictionary
- Line mentioned by academic authority in girls’ school
Buddy explains!
The straight part
We know that "it’s not for boys" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case it’s not for boys = roedean.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.