The most common and most likely answer to this crossword clue is the 6 letter word WEEVIL
I've seen this crossword clue in Independent
W
E
E
V
I
L
More clues leading to the result WEEVIL
- We must take on very bad, destructive beetle
- Whale gutted by nasty insect
- Wife hasn’t provided wicked little pest
- Welcome extremely bad pest
- Insect that’s small and nasty, lacking tail
- Small disgusting tailless insect
- Weed oddly pernicious — it can damage crop
- Little, almost disgusting creature
- Our team’s getting on top of nasty crop pest
- It works against the grain
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 WEEVIL mean?
WEEVIL noun- Any of several small herbivorous beetles in the superfamily Curculionoidea, many having a distinctive snout.
- Any of several small herbivorous beetles in the family Curculionidae belonging to the superfamily Curculionoidea.
- Any of several similar but more distantly related beetles such as the biscuit weevil (Stegobium paniceum).
- A loathsome person.