Cryptic crossword clue
Confirmation of insurance number in private code at last 5,4

The most common and most likely answer to this crossword clue is the 5 plus 4 letter word COVER NOTE

I've seen this crossword clue in The Times
C
O
V
E
R
N
O
T
E

Buddy explains!

The straight part
We know that "Confirmation of insurance" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case confirmation of insurance = cover note.
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.

Crossword Answer definitions

Latest crossword clues with full explanations