The most common and most likely answer to this crossword clue is the 8 letter word DUMB-ASS
I've seen this crossword clue in The Guardian
D
U
M
B
-
A
S
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 DUMB-ASS mean?
DUMB-ASS noun- A stupid or foolish person.
- Stupid, foolish.