The most common and most likely answer to this crossword clue is the 10 letter word ARBORVITAE
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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.
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What does ARBORVITAE mean?
ARBORVITAE noun- Any of several North American or Asian conifers, of the genera Thuja and Thujopsis or the species Platycladus orientalis, grown for timber or ornament.
- The white nerve tissue of the cerebellum that has a branching structure.