Crossword Genius

Upset at fiend showing teeth? (7)

Ross

I believe the answer is:

defiant

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'upset at fiend showing teeth?' is the definition.
I can't tell whether this definition defines the answer.

'upset at fiend' is the wordplay.
'upset' indicates an anagram.
'at'+'fiend'='atfiend'
'atfiend' is an anagram of 'DEFIANT'.

Can you help me to learn more?

(Other definitions for defiant that I've seen before include "showing teeth!" , "Insubordinate" , "Mutinous" , "Uncooperative" , "Boldly resisting" .)

I've seen this clue in The Sun.
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