The most common and most likely answer to this crossword clue is the 9 letter word CLASSLESS
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Buddy explains!

The straight part
We know that "egalitarian" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case egalitarian = classless.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 CLASSLESS mean?
CLASSLESS adjective- Not divided into societal or economic groups.
- Without class or classes.
- Lacking in "class", style, aplomb, etc.