The most common and most likely answer to this crossword clue is the 9 letter word PIGHEADED
I've seen this crossword clue in The Daily Telegraph
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More clues leading to the result PIGHEADED
- Obnoxious person was in the van, refusing to bend
- Revolting animals were so stubborn?
- Obstinate when promoted, soldier with power was leading
- Stubborn Prince, conceited leader being deposed
- Wilful greedy guts was in charge
- Stubborn and cocky, bishop’s overcome by power
- Obstinate detective possibly had edge
Buddy explains!

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 PIGHEADED mean?
PIGHEADED adjective- Obstinate and stubborn to the point of stupidity.