The most common and most likely answer to this crossword clue is the 7 plus 1 plus 8 letter word ANALYST > ANNALIST
I've seen this crossword clue in The Guardian
A
N
A
L
Y
S
T
>
A
N
N
A
L
I
S
T
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.