The most common and most likely answer to this crossword clue is the 4 letter word BUSY
I've seen this crossword clue in Financial Times
B
U
S
Y
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 BUSY mean?
BUSY noun- A police officer.
- To make somebody busy or active; to occupy.
- To rush somebody.
- Crowded with business or activities; having a great deal going on.
- Engaged in activity or by someone else.
- Having a lot going on; complicated or intricate.
- Officious; meddling.