The most common and most likely answer to this crossword clue is the 5 letter word SCENA
S
C
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A
Buddy explains!

The straight part
We know that "Element of operatic performance" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case element of operatic performance = scena.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 SCENA mean?
SCENA noun- A scene in an opera.
- An accompanied dramatic recitative, interspersed with passages of melody, or followed by a full aria.
- The stage of an ancient theatre.