The most common and most likely answer to this crossword clue is the 7 letter word WRAITHS
I've seen this crossword clue in The Daily Telegraph
W
R
A
I
T
H
S
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.
What does WRAITHS mean?
WRAITHS noun- A ghost or specter, especially a person's likeness seen just after their death.