The most common and most likely answer to this crossword clue is the 9 letter word SHOEMAKER
I've seen this crossword clue in The Daily Telegraph
S
H
O
E
M
A
K
E
R
Buddy explains!

The straight part
We know that "worker" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case worker = shoemaker.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 SHOEMAKER mean?
SHOEMAKER noun- A person who makes shoes
- The threadfish.
- A fish, Elagatis pinnulatis, the runner.