The most common and most likely answer to this crossword clue is the 21 letter word COUNTER-REVOLUTIONARY
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Buddy explains!
The straight part
We know that "Opposed to major change" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case opposed to major change = counter-revolutionary.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 COUNTER-REVOLUTIONARY mean?
COUNTER-REVOLUTIONARY noun- A person who opposes a revolution and attempts to reverse the changes made by it
- In opposition to a revolution