The most common and most likely answer to this crossword clue is the 7 letter word MACHETE
I've seen this crossword clue in The Guardian
M
A
C
H
E
T
E
More clues leading to the result MACHETE
- Butcher came with the big knife!
- Accomplice keeps calm initially with explosive weapon
- Confiscated by club, the awful knife
- Teach me to develop into a hacker
- Chopper landing revolutionary in China
- In China, a revolutionary weapon
- Knife one of a pair carried by revolutionary? Just the opposite
- Knife for staff eating the bananas
- The mace deployed as a weapon
- Spice coats the carving knife
Buddy explains!

The straight part
We know that "Chopper" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case chopper = machete.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 MACHETE mean?
MACHETE noun- A sword-like tool used for cutting large plants with a chopping motion, or as a weapon. The blade is usually 50 to 65 centimeters long, and up to three millimeters thick.
- To cut or chop with a machete.
- To hack or chop crudely with a blade other than a machete.