The most common and most likely answer to this crossword clue is the 5 letter word PUBIS
I've seen this crossword clue in The Times
P
U
B
I
S
More clues leading to the result PUBIS
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 = pubis.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 PUBIS mean?
PUBIS noun- The pubic bone; the part of the hipbone forming the front arch of the pelvis