The most common and most likely answer to this crossword clue is the 5 plus 3 plus 6 letter word UNDER THE HAMMER
U
N
D
E
R
T
H
E
H
A
M
M
E
R
Buddy explains!
The straight part
We know that "Being sold" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case being sold = under the hammer.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.