The most common and most likely answer to this crossword clue is the 3 plus 4 plus 4 plus 4 letter word FOR YOUR EYES ONLY
I've seen this crossword clue in The Guardian
F
O
R
Y
O
U
R
E
Y
E
S
O
N
L
Y
More clues leading to the result FOR YOUR EYES ONLY
Buddy explains!
The straight part
We know that "Bond/top secret" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case bond/top secret = for your eyes only.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.