Cryptic crossword clue
High and mighty go back, breaking rank

The most common and most likely answer to this crossword clue is the 8 letter word ARROGANT

I've seen this crossword clue in The Guardian
A
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Buddy explains!

The straight part
We know that "High and mighty" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case high and mighty = arrogant.
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 ARROGANT mean?

ARROGANT adjective
  1. Having excessive pride in oneself, often with contempt or disrespect for others.

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