The most common and most likely answer to this crossword clue is the 3 plus 5 plus 8 plus 4 letter word BIG DAVES BIRTHDAY BASH
B
I
G
D
A
V
E
S
B
I
R
T
H
D
A
Y
B
A
S
H
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.