The most common and most likely answer to this crossword clue is the 8 letter word BUSYBODY
I've seen this crossword clue in The Times
B
U
S
Y
B
O
D
Y
More clues leading to the result BUSYBODY
- One inquisitive policeman by corpse
- Interferer, active and stiff
- An energetic group, one out to make mischief
- Energetic group, one out to make mischief
- Detective overlooking corpse is invasive type
- Interfering personās partial recall of howdy-do by subeditor
- Person who meddles by holding us, and then party, up
- Meddling type engaged by organised unit
Buddy explains!

The straight part
We know that "One inquisitive" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case one inquisitive = busybody.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 BUSYBODY mean?
BUSYBODY noun- Someone who interferes with others; one who is nosy, intrusive or meddlesome.