The most common and most likely answer to this crossword clue is the 8 letter word SHOPTALK
S
H
O
P
T
A
L
K
Buddy explains!
The straight part
We know that "Business discussed after hours" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case business discussed after hours = shoptalk.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 SHOPTALK mean?
SHOPTALK noun- Discussion of business in a social setting, especially using jargon.