The most common and most likely answer to this crossword clue is the 9 letter word CRANBERRY
I've seen this crossword clue in The Guardian
C
R
A
N
B
E
R
R
Y
More clues leading to the result CRANBERRY
Buddy explains!

The straight part
We know that "bush" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case bush = cranberry.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 CRANBERRY mean?
CRANBERRY noun- A shrub belonging to the section Vaccinium sect. Oxycoccus of the genus Vaccinium.
- The edible red berry of that shrub.
- An intense red colour, like that of a cranberry
- Of the intense red colour of a cranberry.