The most common and most likely answer to this crossword clue is the 10 letter word SUPERVISOR
I've seen this crossword clue in Independent
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More clues leading to the result SUPERVISOR
Buddy explains!
The straight part
We know that "One overseeing" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case one overseeing = supervisor.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 SUPERVISOR mean?
SUPERVISOR noun- A person with the official task of overseeing the work of a person or group, or of other operations and activities.
- A person who monitors someone to make sure they comply with rules or other requirements set for them.
- In certain states, an elected member of the governing body for a county which is called the board of supervisors.
- A process responsible for managing other processes.