Cryptic crossword clue
Bright red, I try expressing right number in class perhaps 11

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

C
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Buddy explains!

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 CARDINALITY mean?

CARDINALITY noun
  1. (of a set) The number of elements a given set contains.
  2. The property of a relationship between a database table and another one, specifying whether it is one-to-one, one-to-many, many-to-one, or many-to-many.
  3. The status of a cardinal.

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