The most common and most likely answer to this crossword clue is the 8 letter word UNIVALVE
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More clues leading to the result UNIVALVE
Buddy explains!
The straight part
We know that "Shell" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case shell = univalve.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 UNIVALVE mean?
UNIVALVE noun- A univalve mollusk or its shell.
- Having one valve; typically used to refer to mollusks, notably slugs and snails.
- Consisting of a single valve or piece, used to refer to a shell.