The most common and most likely answer to this crossword clue is the 8 letter word BRANCHED
I've seen this crossword clue in The Daily Telegraph
B
R
A
N
C
H
E
D
More clues leading to the result BRANCHED
Buddy explains!

The straight part
We know that "Like tree" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case like tree = branched.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 BRANCHED mean?
BRANCHED verb- To arise from the trunk or a larger branch of a tree.
- To produce branches.
- To (cause to) divide into separate parts or subdivisions.
- To jump to a different location in a program, especially as the result of a conditional statement.
- To discipline (a union member) at a branch meeting.
- Having branches.