The most common and most likely answer to this crossword clue is the 2 plus 6 letter word EX NIHILO
I've seen this crossword clue in Financial Times
E
X
N
I
H
I
L
O
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.