The most common and most likely answer to this crossword clue is the 5 letter word OCCUR
I've seen this crossword clue in The Guardian
O
C
C
U
R
More clues leading to the result OCCUR
- Exist as bad man under commander
- Old police company, climbing, come to pass
- Our welcoming cricket club brings spring to mind
- Happen to rain heavily around cricket club, cutting off parking
- Company climbing with dog come to pass
- Gold-plated carbon and copper exist
- Take place in middle of row C with dog
- Happen to see officer in command around the old city
- Fall on the same day and time in Bow
- Copied in what we have come about
Buddy explains!

The straight part
We know that "Fall on the same day/Fall on the same day" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case fall on the same day/fall on the same day = occur.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 OCCUR mean?
OCCUR verb- To happen or take place.
- To present or offer itself.
- To come or be presented to the mind; to suggest itself.
- To be present or found.