The most common and most likely answer to this crossword clue is the 5 letter word MAHOE
M
A
H
O
E
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 = mahoe.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 MAHOE mean?
MAHOE noun- Any of certain trees in the mallow family, native to the Caribbean.
- Either of two different trees, usually found around the tropics.