The most common and most likely answer to this crossword clue is the 10 plus 5 letter word SATURATION POINT
I've seen this crossword clue in Financial Times
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More clues leading to the result SATURATION POINT
- After day you limit, then direct, when capacity's reached
- Settled wee kitty moving in and there’s no room for any more at this juncture
- Situation patron manufactured putting limit on possible number
- Planet mostly at one concerning aim for population limit
- A naturist option when dancing is the limit
- Forced Unitarians to top the limit
- As I put onion tart out: ‘That’s the limit!’
- One hundred per cent humidity – it’s the limit!
Buddy explains!
The straight part
We know that "limit on possible number" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case limit on possible number = saturation point.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.