The most common and most likely answer to this crossword clue is the 9 letter word EUCALYPTI
I've seen this crossword clue in The Guardian
E
U
C
A
L
Y
P
T
I
More clues leading to the result EUCALYPTI
- Oil producers having typical ground south of Brussels
- Group of nations thus abandons song: it backed oil producers
- Typical reforms suppressed by Brussels oil producers
- Australian natives and another wasting money — flaming typical
- Typical! EU corrupted by oil suppliers
- WI song so neglected in Brussels it upset oil suppliers
- Typical EU confusion finds Flora in Oz
- International group replanted typical trees
- Raise it with signal about playground trees
- Pity a clue’s anagrammed “trees”
Buddy explains!
The straight part
We know that "trees" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case trees = eucalypti.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 EUCALYPTI mean?
EUCALYPTI noun- Any of many trees, of genus Eucalyptus, native mainly to Australia.
- A greenish colour, like that of a eucalyptus leaves.