The most common and most likely answer to this crossword clue is the 9 letter word NUMERATOR
I've seen this crossword clue in Financial Times
N
U
M
E
R
A
T
O
R
More clues leading to the result NUMERATOR
- Rare mount beaten over the line, fractionally?
- Line drawn under this word of doubt over muse parting nicer lips
- One reckoning to be topless as the one on top in something vulgar?
- Superior figure mature, no larking about then right?
- One is on top of something learned about in maths class
- One gets over the line in mathematics
- In return race, nursing injured toe and arm, one’s over the line!
- Not a rare amount becoming higher figure
- Fractional part of true Roman ruin
- What’s to be divided up neat rum or fizz?
Buddy explains!

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.
What does NUMERATOR mean?
NUMERATOR noun- The number or expression written above the line in a fraction (such as 1 in ½).
- An enumerator; someone who counts things.