The most common and most likely answer to this crossword clue is the 9 letter word RETAILING
I've seen this crossword clue in The Daily Telegraph
R
E
T
A
I
L
I
N
G
More clues leading to the result RETAILING
Buddy explains!
The straight part
We know that "Once again putting an end to/selling" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case once again putting an end to/selling = retailing.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 RETAILING mean?
RETAILING verb- To sell at retail, or in small quantities directly to customers.
- To sell secondhand, or in broken parts.
- To repeat or circulate (news or rumours) to others.
- The business of selling directly to the consumer; retail.