The most common and most likely answer to this crossword clue is the 6 letter word APHIDS
I've seen this crossword clue in The Guardian
A
P
H
I
D
S
More clues leading to the result APHIDS
- Inside scrapheap hid some bugs
- Garden pests concealed in sap, unusually
- Greek character amongst posters becoming pests
- A clergyman suppressed initial story of pests
- Bugs concealed by soprano under a piano
- Part of flytrap hid some bugs
- Pests concealed in recess mostly
- Little green suckers hid in bubbling spa
- A research graduate's catching current pests
- Spring up catching concealed insects
Buddy explains!

The straight part
We know that "Bugs" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case bugs = aphids.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 APHIDS mean?
APHIDS noun- Sapsucking pest insect of the superfamily Aphidoidea; an aphidian.