Eager to fight but possibly fainted (7)

I believe the answer is:

defiant

I'm a little stuck... Click here to teach me more about this clue!

'eager to fight' is the definition.
I can't tell whether this definition defines the answer.

'possibly fainted' is the wordplay.
'possibly' indicates an anagram.
'fainted' is an anagram of 'DEFIANT'.

'but' is the link.

Can you help me to learn more?

(Other definitions for defiant that I've seen before include "Uncooperative" , "Unyielding" , "Disobedient" , "Refusing to comply" , "Insubordinate" .)

I've seen this clue in The Globe and Mail.

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