Cryptic crossword clue
Silly posh idiot first to oppress worker, one in sales 4,9

The most common and most likely answer to this crossword clue is the 4 plus 9 letter word SHOP ASSISTANT

I've seen this crossword clue in The Daily Telegraph
S
H
O
P
A
S
S
I
S
T
A
N
T

Buddy explains!

The straight part
We know that "one in sales" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case one in sales = shop assistant.
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.

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