The most common and most likely answer to this crossword clue is the 8 letter word QUOTIENT
I've seen this crossword clue in The Guardian
Q
U
O
T
I
E
N
T
More clues leading to the result QUOTIENT
- Result of division not quite worked out
- Not quite free to give the result of the division
- Qaos regularly going round the bend: 1/2 to 1/10 ratio?
- Result of division not quite working out
- Result of division not quite resolved
- Share not quite redistributed
- Name price, subtract 1, divide by 10, divided by 1, getting this result?
- Mathematical number not quite worked out
- Could be not quite the answer
- Intelligence rating that results from division
Buddy explains!

The straight part
We know that "ratio" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case ratio = quotient.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 QUOTIENT mean?
QUOTIENT noun- The number resulting from the division of one number by another.
- By analogy, the result of any process that is the inverse of multiplication as defined for any mathematical entities other than numbers.
- A quotum or quota.