The most common and most likely answer to this crossword clue is the 9 letter word SALESLADY
I've seen this crossword clue in Independent
S
A
L
E
S
L
A
D
Y
Buddy explains!
The straight part
We know that "One selling" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case one selling = saleslady.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 SALESLADY mean?
SALESLADY noun- A woman who is employed as a salesclerk.