The most common and most likely answer to this crossword clue is the 3 letter word ANT
I've seen this crossword clue in The Guardian
A
N
T
More clues leading to the result ANT
- Insect in pants?
- Six-footer among banyan trees
- Article on origin of tree insect
- Intake of Peruvian tamanduas?
- Worker wanting a bit
- Against dismissing current social worker
- Worker produced article on time
- Not a fan of short hill-dweller
- 7 at nets beginning to notice rising
- High-rise accommodation for workers?
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 = ant.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 ANT mean?
ANT noun- Any of various insects in the family Formicidae in the order Hymenoptera, typically living in large colonies composed almost entirely of flightless females.
- A Web spider.
- To rub insects, especially ants, on one's body, perhaps to control parasites or clean feathers.