The most common and most likely answer to this crossword clue is the 8 letter word FRACTURE
I've seen this crossword clue in The Guardian
F
R
A
C
T
U
R
E
More clues leading to the result FRACTURE
- 1 ingeniously engineers break
- Queen, in fact, beside river for a break
- Grass mostly found among fine speed and crack
- Fellow on track falls over during sprint resulting in this?
- ... “fur crate restoration break”
- Break French law before old city election at first
- Break free suddenly, pretend you’re captured
Buddy explains!

The straight part
We know that "break" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case break = fracture.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 FRACTURE mean?
FRACTURE noun- An instance of breaking, a place where something has broken.
- A break in bone or cartilage.
- A fault or crack in a rock.
- To break, or cause something to break.
- To amuse (a person) greatly; to split someone's sides.