The most common and most likely answer to this crossword clue is the 3 plus 5 letter word SEA SNAIL
S
E
A
S
N
A
I
L
More clues leading to the result SEA SNAIL
- In sound, notice poles trouble a marine creature
- Old ducks spell trouble for gastropod
- Wave as saline as a salt-water creature
- Shellfish suffer after three months without oxygen
- Unctuous creature making trouble after e.g. summer without love
- Marine animal consuming rubbish is an edible mollusc
- Perhaps limpet mine finally smothered by military unit before capture
Buddy explains!

The straight part
We know that "edible/mollusc" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case edible/mollusc = sea snail.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.