Cryptic crossword clue
Without resistance began to be high and mighty 5-2

The most common and most likely answer to this crossword clue is the 8 letter word STUCK-UP

I've seen this crossword clue in Independent
S
T
U
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P

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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 STUCK-UP mean?

STUCK-UP adjective
  1. Snobbish, conceited; believing oneself to be better than others, usually because of abundant success; haughty; arrogant or egotistical.
  2. Jammed; stuck and unable to move.

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