The most common and most likely answer to this crossword clue is the 9 letter word FIBONACCI
F
I
B
O
N
A
C
C
I
More clues leading to the result FIBONACCI
- Unusually fab, iconic name for a series
- Series creator coming up with some Wiccan obi fantasy
- Maths whiz, wonderfully fab, iconic
- Story about case facing Italy’s top mathematician
- Mathematician’s lie about half-chance
- Lie about a small volume by current mathematician
- Story about account I put together for mathematician
- Mathematician has story about accident, though no damage
- Deceit cut cocaine supply for mathematician
- Lie about a hundred and 101 in number sequence
Buddy explains!
The straight part
We know that "Maths whiz" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case maths whiz = fibonacci.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.