The most common and most likely answer to this crossword clue is the 7 letter word CELADON
I've seen this crossword clue in The Guardian
C
E
L
A
D
O
N
Buddy explains!
The straight part
We know that "Green" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case green = celadon.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 CELADON mean?
CELADON noun- A pale green colour, possibly tinted with gray.
- A pale green Chinese glaze.
- A ceramic ware with a pale green glaze.
- Of a pale green colour tinted with gray.