The most common and most likely answer to this crossword clue is the 6 letter word FIBULA
I've seen this crossword clue in Financial Times
F
I
B
U
L
A
More clues leading to the result FIBULA
- Flu jab initially gone wrong, with first of injections in part of wrong limb!
- Part of skeleton is fit, but lab reaching no conclusions
- Bon e to lie next to another that is nameless
- Clasp one’s leg-bone
- Seen with this bone broken? That could be unfeasible
- Lie at first under limp ankle bone
- Story to emulate is essentially below the knee
Buddy explains!

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 FIBULA mean?
FIBULA noun- An ancient kind of brooch used to hold clothing together, similar in function to the modern safety pin.
- The smaller of the two bones in the lower leg, the calf bone.