The most common and most likely answer to this crossword clue is the 5 plus 4 letter word QUEEN POST
I've seen this crossword clue in The Guardian
Q
U
E
E
N
P
O
S
T
Buddy explains!
The straight part
We know that "important roof timber" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case important roof timber = queen post.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.