The most common and most likely answer to this crossword clue is the 11 letter word PARTICULARS
I've seen this crossword clue in The Daily Telegraph
P
A
R
T
I
C
U
L
A
R
S
Buddy explains!

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 PARTICULARS mean?
PARTICULARS noun- A small individual part of something larger; a detail, a point.
- A person's own individual case.
- (chiefly in plural) A particular case; an individual thing as opposed to a whole class. (Opposed to generals, universals.)
- The details or specifics of something.