The most common and most likely answer to this crossword clue is the 6 letter word CAUSAL
I've seen this crossword clue in The Guardian
C
A
U
S
A
L
More clues leading to the result CAUSAL
Buddy explains!
The straight part
We know that "indicating what gives rise to event" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case indicating what gives rise to event = causal.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 CAUSAL mean?
CAUSAL noun- (grammar) a word (such as because) that expresses a reason or a cause
- Of, relating to, or being a cause of something; causing