The most common and most likely answer to this crossword clue is the 10 letter word BUSHWHACKS
I've seen this crossword clue in The Daily Telegraph
B
U
S
H
W
H
A
C
K
S
Buddy explains!
The straight part
We know that "Clears jungle" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case clears jungle = bushwhacks.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 BUSHWHACKS mean?
BUSHWHACKS verb- To travel through thick wooded country, cutting away scrub to make progress
- To fight, as a guerilla, especially in wooded country
- To ambush