The most common and most likely answer to this crossword clue is the 3 letter word MIA
M
I
A
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 MIA mean?
MIA noun- An ancient bluffing game played with dice.
- Bulimia (used especially by the pro-mia movement).