The most common and most likely answer to this crossword clue is the 8 letter word OVERSEER
I've seen this crossword clue in The Daily Telegraph
O
V
E
R
S
E
E
R
More clues leading to the result OVERSEER
- Manager‘s racing car problem: Tesla’s been stolen
- Master love poetry with a little uncertainty
- How Rees becomes the foreman?
- One manages old piece of poetry with little hesitation
- Severe or twisted boss
- Person supervising old English writing, perhaps, including poetry
- One supervising old poet’s output in front of Queen
- Supervisor in charge of someone wise
Buddy explains!

The straight part
We know that "Supervisor" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case supervisor = overseer.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 OVERSEER mean?
OVERSEER noun- One who oversees or supervises.
- A critic.