The most common and most likely answer to this crossword clue is the 8 letter word EXPOUNDS
I've seen this crossword clue in The Daily Telegraph
E
X
P
O
U
N
D
S
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 EXPOUNDS mean?
EXPOUNDS verb- To set out the meaning of; to explain or discuss at length
- To make a statement, especially at length.