The most common and most likely answer to this crossword clue is the 11 letter word FRACTIONATE
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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 = fractionate.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 FRACTIONATE mean?
FRACTIONATE verb- To separate (a mixture) into its individual constituents by exploiting differences in some chemical or physical property, such as boiling point, particle size, solubility etc.
- To divide each plaintext symbol into several ciphertext symbols as a preliminary stage of encryption.
- To use the technique of fractionation in hypnosis.