The most common and most likely answer to this crossword clue is the 7 letter word ABDOMEN
I've seen this crossword clue in The Guardian
A
B
D
O
M
E
N
More clues leading to the result ABDOMEN
- Sailor joins party workers in the middle?
- Prognostication connected with terribly bad stomach
- Corporation’s bid voided after a warning
- Moaned awfully about start of bloating in belly
- Stomach final word about batchelor party
- Paunch? When it wobbles, bad sign
- Doctor moaned about beginning of bulging belly
- Belly beginning to bulge — notice old chaps holding that in!
- Awfully bad sign for part of the body
- Middle of day, flyers put over sign
Buddy explains!

The straight part
We know that "part of the body" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case part of the body = abdomen.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 ABDOMEN mean?
ABDOMEN noun- The fat surrounding the belly.
- The belly, or that part of the body between the thorax and the pelvis, not including the back; or in some lower vertebrates, the portion between the cardiac and caudal regions.
- The cavity of the belly, which is lined by the peritoneum, and contains the viscera; often restricted in humans to the part between the diaphragm and the commencement of the pelvis, the remainder being called the pelvic cavity.
- The posterior section of the body, behind the thorax, in insects, crustaceans, and other Arthropoda.