The most common and most likely answer to this crossword clue is the 9 letter word PITCHFORK
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More clues leading to the result PITCHFORK
Buddy explains!

The straight part
We know that "instrument" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case instrument = pitchfork.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 PITCHFORK mean?
PITCHFORK noun- An agricultural tool comprising a fork attached to a long handle used for pitching hay or bales of hay high up onto a haystack.
- A tuning fork.
- To toss or carry with a pitchfork.
- To throw suddenly.