The most common and most likely answer to this crossword clue is the 8 letter word TIP-OFFS
I've seen this crossword clue in The Guardian
T
I
P
-
O
F
F
S
More clues leading to the result TIP-OFFS
Buddy explains!

The straight part
We know that "confidential information" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case confidential information = tip-offs.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 TIP-OFFS mean?
TIP-OFFS noun- An obvious clue or indication.
- A report of suspicious behaviour, especially to an authority.