The most common and most likely answer to this crossword clue is the 7 letter word STERNUM
I've seen this crossword clue in The Times
S
T
E
R
N
U
M
More clues leading to the result STERNUM
- Amount of money, including flyer, that’s found in chest
- Bone problem besetting winger
- A few mentioned pinching diver's bone
- Something in chest to check when entertaining wild run
- Bone from bird included in total
- It’s found between breasts and rear ends when one goes topless
- In addition, bird has a breastbone
- Bone is hard? I’m pondering
- Reckoning to eat a bird — part of the breast
- Bone in grave: I’m not sure
Buddy explains!

The straight part
We know that "Something in chest" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case something in chest = sternum.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 STERNUM mean?
STERNUM noun- The breastbone
- The sclerotized plate of spiders, between the coxae, marking the floor of the cephalothorax