The most common and most likely answer to this crossword clue is the 9 letter word INCIDENCE
I've seen this crossword clue in The Guardian
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More clues leading to the result INCIDENCE
- Frequency of events some might understand?
- Rate working for police? Coppers quietly resigning
- With investment of 500, possibly nice when twice the amount
- Falling, with drink unfinished, in pub before church
- Frequency of chic detectives taking a measure at the church
- Relative frequency of occurrence of events on the radio
- Company managed decline, losing large frequency
- Frequency of occurrence with small company would be a fluke
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 INCIDENCE mean?
INCIDENCE noun- The act of something happening; occurrence.
- The extent or the relative frequency of something happening.
- The manner of falling; bearing or onus, as of a tax that falls unequally.
- The striking of radiation or a projectile upon a surface.
- A measure of the rate of new occurrence of a given medical condition in a population within a specified period of time.
- The falling of a point on a line, or a line on a plane.