The most common and most likely answer to this crossword clue is the 9 letter word TIMESTAMP
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More clues leading to the result TIMESTAMP
Buddy explains!
The straight part
We know that "one tracks/when events occur" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case one tracks/when events occur = timestamp.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 TIMESTAMP mean?
TIMESTAMP noun- A variable containing the date and time at which an event occurred, often included in a log to track the sequence of events.
- To record the date and time of (an event, etc).