The most common and most likely answer to this crossword clue is the 4 letter word GAGA
I've seen this crossword clue in Financial Times
G
A
G
A
More clues leading to the result GAGA
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 GAGA mean?
GAGA adjective- Mentally senile.
- Crazy.
- Infatuated.
- A variant of dodgeball played inside a fenced area, usually a hexagon or octagon.