The most common and most likely answer to this crossword clue is the 10 letter word CATEGORIES
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More clues leading to the result CATEGORIES
Buddy explains!
The straight part
We know that "classes" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case classes = categories.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 CATEGORIES mean?
CATEGORIES noun- A group, often named or numbered, to which items are assigned based on similarity or defined criteria.
- A collection of objects, together with a transitively closed collection of composable arrows between them, such that every object has an identity arrow, and such that arrow composition is associative.