Cryptic crossword clue
Volunteers performed, say, a special set of Neapolitan dances 11

The most common and most likely answer to this crossword clue is the 11 letter word TARANTELLAS

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Buddy explains!

The straight part
We know that "set of Neapolitan dances" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case set of neapolitan dances = tarantellas.
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 TARANTELLAS mean?

TARANTELLAS noun
  1. A rapid dance in 6/8 time, originating in Italy, or a piece of music for such a dance.

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