The most common and most likely answer to this crossword clue is the 11 letter word MASTERCLASS
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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 MASTERCLASS mean?
MASTERCLASS noun- A class, typically in a performing art such as music or drama, in which a teacher listens to and critiques the performance of individual students, one at a time, while the other students look on.
- An action or series of actions that serve to demonstrate a person's mastery of a subject.
- A brilliant or virtuosic performance.