The most common and most likely answer to this crossword clue is the 10 letter word CONTRACTOR
I've seen this crossword clue in The Daily Telegraph
C
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Buddy explains!
The straight part
We know that "One engaged to work" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case one engaged to work = contractor.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 CONTRACTOR mean?
CONTRACTOR noun- A person or company that builds or improves buildings.
- A person or company that performs specific tasks like electrical or plumbing work in construction projects.
- A person or company hired to maintain existing facilities like air conditioning systems, groundskeeping, etc.
- A person hired to do a job on a business contract, as opposed to a permanent employee.