The most common and most likely answer to this crossword clue is the 4 plus 4 letter word LONG LOST
I've seen this crossword clue in The Guardian
L
O
N
G
L
O
S
T
More clues leading to the result LONG LOST
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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 LONG LOST mean?
LONG LOST adjective- Having been missing or unknown for a long period of time.