The most common and most likely answer to this crossword clue is the 7 letter word ACAROID
I've seen this crossword clue in Financial Times
A
C
A
R
O
I
D
More clues leading to the result ACAROID
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 ACAROID mean?
ACAROID adjective- Shaped like or resembling a mite.