The most common and most likely answer to this crossword clue is the 8 letter word TIMBERED
I've seen this crossword clue in The Guardian
T
I
M
B
E
R
E
D
More clues leading to the result TIMBERED
Buddy explains!

The straight part
We know that "made of wood" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case made of wood = timbered.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 TIMBERED mean?
TIMBERED verb- To fit with timbers.
- To construct, frame, build.
- To light or land on a tree.
- To make a nest.
- To surmount as a timber does.
- Wooded; bearing timber; forested.
- Made from timber, especially large or coarsely finished timber.