The most common and most likely answer to this crossword clue is the 10 letter word CHARTREUSE
I've seen this crossword clue in The Guardian
C
H
A
R
T
R
E
U
S
E
More clues leading to the result CHARTREUSE
- Monitor about to resort to drink
- Green with plan to recycle
- Green plan to recycle
- Mrs Mopp has time to recycle liqueur
- Suchet’s fancy, blending in variety of rare liqueur
- Cold animal about to resort to drink
- Plan to recycle liqueur
- Green, cleaner recycling involves tonnes
- Liqueur exemplified by environmentally friendly map- readers?
- One gets drunk thus career is ruined
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 = chartreuse.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 CHARTREUSE mean?
CHARTREUSE noun- A yellow or green liqueur made by Carthusian monks.
- A greenish-yellow colour.
- A kind of enamelled pottery.
- Of a bright yellowish-green colour.