The most common and most likely answer to this crossword clue is the 7 letter word ANYBODY
I've seen this crossword clue in The Daily Telegraph
A
N
Y
B
O
D
Y
Buddy explains!
The straight part
We know that "Everyone" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case everyone = anybody.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 ANYBODY mean?
ANYBODY pronoun- Any one out of an indefinite number of persons; anyone; any person.
- A person of some consideration or standing.