Cryptic crossword clue
Doctor, one breaking smart fellow’s chemistry apparatus 7

The most common and most likely answer to this crossword clue is the 7 letter word ALEMBIC

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The straight part
We know that "chemistry apparatus /chemistry apparatus" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case chemistry apparatus /chemistry apparatus = alembic.
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 ALEMBIC mean?

ALEMBIC noun
  1. An early chemical apparatus, consisting of two retorts connected by a tube, used to purify substances by distillation

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