Cryptic crossword clue
Be involved, plastic destroys marine habitats 6-4

The most common and most likely answer to this crossword clue is the 6 plus 4 letter word OYSTER BEDS

I've seen this crossword clue in The Daily Telegraph
O
Y
S
T
E
R
B
E
D
S

Buddy explains!

The straight part
We know that "marine habitats" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case marine habitats = oyster beds.
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.

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