Cryptic crossword clue
Rendering standard line in opera I perform 11

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

I've seen this crossword clue in The Guardian
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Buddy explains!

The straight part
We know that "Rendering standard" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case rendering standard = normalising.
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 NORMALISING mean?

NORMALISING verb
  1. To make normal, to make standard.
  2. To format in a standardized manner, to make consistent.
  3. To reduce to variations by excluding irrelevant aspects.
  4. To return a set of points (switches) to the normal position.
  5. (of points) To return to the normal position from the reverse position.
  6. To subject to normalization; to eliminate redundancy in (a model for storing data).
  7. To divide a vector by its magnitude to produce a unit vector.

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