The most common and most likely answer to this crossword clue is the 7 letter word DEFIANT
I've seen this crossword clue in The Times
D
E
F
I
A
N
T
More clues leading to the result DEFIANT
- Obstinate doctor fainted
- Excellent worker — I’ll get stuck in, resisting authority
- Boy, handy without being challenging
- Dicky fainted when challenging
- Bold of French automotive firm to acquire centre in Afghanistan
- Uncooperative suspect fainted
- Openly disobedient, fainted when disciplined
- Expert must accept Botham, for example, being intransigent
- Aggressive expert — this writer with article penned
- Notes found on Scot featuring in paper being bold
Buddy explains!

The straight part
We know that "Obstinate" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case obstinate = defiant.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 DEFIANT mean?
DEFIANT noun- One who defies opposition.
- Defying.
- Boldly resisting opposition.