The most common and most likely answer to this crossword clue is the 7 letter word ENVYING
I've seen this crossword clue in The Times
E
N
V
Y
I
N
G
More clues leading to the result ENVYING
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? = envying.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 ENVYING mean?
ENVYING verb- To feel displeasure or hatred towards (someone) for their good fortune or possessions.
- To have envious feelings (at).
- To give (something) to (someone) grudgingly or reluctantly; to begrudge.
- To show malice or ill will; to rail.
- To do harm to; to injure; to disparage.
- To hate.
- To emulate.
- A feeling of envy.