The most common and most likely answer to this crossword clue is the 7 letter word ENVIOUS
I've seen this crossword clue in The Guardian
E
N
V
I
O
U
S
More clues leading to the result ENVIOUS
- Vino Sue ordered, leaving you resentful
- Dissatisfied six caught by English common sense
- Jealous of three points victoryby United brought in
- Green unit backs taking flying bomb to America
- Green vines winding round the tops of oaks, unusually
- Green vines up the wall embodying Oxford University?
- Eastern Nevada promises to be green
- Nice solvers hug Arachne on edges of Edmonton Green
- Resentful, one's served up about six before us
- Resentful and unscrupulous, seizing note daughter dropped
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 = envious.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 ENVIOUS mean?
ENVIOUS adjective- Feeling or exhibiting envy; jealously desiring the excellence or good fortune of another; maliciously grudging
- Excessively careful; cautious.
- Malignant; mischievous; spiteful.
- Inspiring envy.