The most common and most likely answer to this crossword clue is the 6 letter word ASSORT
I've seen this crossword clue in Financial Times
A
S
S
O
R
T
More clues leading to the result ASSORT
- Behind or first in taxi rank
- What kind of class?
- Arrange completely powerless travel document
- Fool getting nothing right in class
- Classify papers missing a couple of pages
- Like boozer, welcoming right mix
- Class dunce has nothing right
- Del Boy’s bird’s under 17 — class!
- A small and kind group
- Distribute to guards in vessel endlessly
Buddy explains!

The straight part
We know that "What kind of class?" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case what kind of class? = assort.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 ASSORT mean?
ASSORT verb- To sort or arrange according to characteristic or class.
- To be of a kind with.
- To be associated with; to consort with.
- To furnish with, or make up of, various sorts or a variety of goods.