The most common and most likely answer to this crossword clue is the 9 letter word FACTSHEET
I've seen this crossword clue in The Times
F
A
C
T
S
H
E
E
T
Buddy explains!
The straight part
We know that "Information document" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case information document = factsheet.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 FACTSHEET mean?
FACTSHEET noun- A printed presentation of data that shows the most important or relevant facts in a simple, easy-to-read manner