The most common and most likely answer to this crossword clue is the 10 letter word GREENHEART
I've seen this crossword clue in Financial Times
G
R
E
E
N
H
E
A
R
T
More clues leading to the result GREENHEART
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 GREENHEART mean?
GREENHEART noun- A type of tree (Chlorocardium rodiei) native to Guyana.
- Timber from the greenheart tree.
- A type of shrub (Colubrina arborescens) native to Florida and the Caribbean.