The most common and most likely answer to this crossword clue is the 9 letter word EXCAVATOR
E
X
C
A
V
A
T
O
R
Buddy explains!

The straight part
We know that "machine" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case machine = excavator.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 EXCAVATOR mean?
EXCAVATOR noun- A person who excavates.
- A curette used to scrape out pathological material.
- A vehicle, often on tracks, used to dig ditches etc; a backhoe; digger.