The most common and most likely answer to this crossword clue is the 10 letter word STATOBLAST
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Buddy explains!
The straight part
We know that "Bud" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case bud = statoblast.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 STATOBLAST mean?
STATOBLAST noun- One of a peculiar kind of internal buds, or germs, produced in the interior of certain Bryozoa and sponges. They are protected by a firm covering, and are usually destined to perpetuate the species during the winter season. They burst open and develop in the spring. In some freshwater sponges they serve to preserve the species during the dry season.