The most common and most likely answer to this crossword clue is the 8 letter word SKIVVIES
I've seen this crossword clue in The Guardian
S
K
I
V
V
I
E
S
More clues leading to the result SKIVVIES
Buddy explains!

The straight part
We know that "workers" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case workers = skivvies.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 SKIVVIES mean?
SKIVVIES noun- Underwear, particularly men′s underwear.
- A female domestic servant, especially one employed for menial work.
- (Vietnam War) A prostitute.
- A close-fitting, long-sleeved T-shirt with a rolled collar.