The most common and most likely answer to this crossword clue is the 6 letter word LEAFED
I've seen this crossword clue in The Daily Telegraph
L
E
A
F
E
D
Buddy explains!
The straight part
We know that "is green, perhaps" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case is green, perhaps = leafed.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 LEAFED mean?
LEAFED verb- To produce leaves; put forth foliage.
- To divide (a vegetable) into separate leaves.
- (chiefly in combination) Having a leaf or leaves (of the specified kind).