The most common and most likely answer to this crossword clue is the 2 letter word EG
E
G
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 EG mean?
EG adverb- "for example" or "for the sake of an example": used to introduce an illustrative example or short list of examples.