The most common and most likely answer to this crossword clue is the 11 letter word SALESPERSON
I've seen this crossword clue in Financial Times
S
A
L
E
S
P
E
R
S
O
N
More clues leading to the result SALESPERSON
Buddy explains!
The straight part
We know that "One working as rep no less" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case one working as rep no less = salesperson.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 SALESPERSON mean?
SALESPERSON noun- A person whose job is to sell things, either in a shop/store or elsewhere.