The most common and most likely answer to this crossword clue is the 10 letter word LEAF-GREEN
I've seen this crossword clue in The Guardian
L
E
A
F
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G
R
E
E
N
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.
Crossword Answer definitions
LEAF-GREEN noun- A bright green like the usual colour of leaves.
- Having leaf green as its colour.