The most common and most likely answer to this crossword clue is the 7 letter word COCOONS
I've seen this crossword clue in The Daily Telegraph
C
O
C
O
O
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S
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 COCOONS mean?
COCOONS noun- The silky protective case spun by the larvae of some insects in which they metamorphose, the pupa.
- Any similar protective case, whether real or metaphorical.
- To envelop in a protective case
- To withdraw into such a case.