The most common and most likely answer to this crossword clue is the 8 letter word UNSOLVED
I've seen this crossword clue in The Guardian
U
N
S
O
L
V
E
D
More clues leading to the result UNSOLVED
Buddy explains!
The straight part
We know that "this clue will be" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case this clue will be = unsolved.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 UNSOLVED mean?
UNSOLVED adjective- Not yet solved.