The most common and most likely answer to this crossword clue is the 4 plus 4 letter word MEAT HOOK
I've seen this crossword clue in The Guardian
M
E
A
T
H
O
O
K
Buddy explains!
The straight part
We know that "butcher’s device" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case butcher’s device = meat hook.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.