The most common and most likely answer to this crossword clue is the 5 letter word HYOID
H
Y
O
I
D
More clues leading to the result HYOID
Buddy explains!

The straight part
We know that "Bone" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case bone = hyoid.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 HYOID mean?
HYOID noun- The hyoid bone.
- Shaped like a U, or like the letter upsilon; specifically, designating a bone or group of bones supporting the tongue.