The most common and most likely answer to this crossword clue is the 7 letter word WOODIER
I've seen this crossword clue in Independent
W
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Buddy explains!
The straight part
We know that "With more trees" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case with more trees = woodier.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 WOODIER mean?
WOODIER adjective- Covered in woods; wooded.
- Belonging to the woods; sylvan.
- Made of wood, or having wood-like properties.
- Non-herbaceous.
- Lignified.