The most common and most likely answer to this crossword clue is the 6 plus 4 letter word HERMIT CRAB
I've seen this crossword clue in Financial Times
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More clues leading to the result HERMIT CRAB
- Shore creature caught with right bait swimming near Channel island
- Solitary carp, an aquatic creature
- Crustacean’s birth camera briefly shot
- Scuttling 1cm, rather black crustacean
- Crustacean her guy’s served up – grumble follows
- It occupies sort of chamber, rear end inside
- Sole occupant of vacant seaside mobile home?
- Sea creature — the thing caught on bank around east of island
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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.