The most common and most likely answer to this crossword clue is the 8 letter word ASSEMBLY
I've seen this crossword clue in The Times
A
S
S
E
M
B
L
Y
More clues leading to the result ASSEMBLY
- Criminal may bless court
- Sickly after vacation, blames bad diet
- Cleverly hiding bungle, backing company
- Online factory work?
- Convention competently handles failure, on reflection
- Invited 50 into foreign embassy for meeting
- 14 fabrication
- Cleverly holds back room for military meeting
- Competently keeping up trifle collection
- Meeting, with skill, covering disorder up
Buddy explains!

The straight part
We know that "diet" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case diet = assembly.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 ASSEMBLY mean?
ASSEMBLY noun- A set of pieces that work together in unison as a mechanism or device.
- The act of putting together a set of pieces, fragments, or elements.
- A congregation of people in one place for a purpose.
- A legislative body.
- A beat of the drum or sound of the bugle as a signal to troops to assemble.
- In Microsoft .NET, a building block of an application, similar to a DLL, but containing both executable code and information normally found in a DLL's type library. The type library information in an assembly, called a manifest, describes public functions, data, classes, and version information.
- A programming language in which the source code of programs is composed of mnemonic instructions, each of which corresponds directly to a machine instruction for a particular processor.