Crossword Genius

Informant? I dispute that with raging fire! (8)

Ross

I believe the answer is:

notifier

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'informant?' is the definition.
(thesaurus)

'i dispute that with raging fire' is the wordplay.
'i dispute' becomes 'noti' (I can't justify this - if you can you should give a lot more credence to this answer).
'that with' is a charade indicator (letters next to each other).
'raging' indicates anagramming the letters.
'fire' with letters rearranged gives 'fier'.
'noti'+'fier'='NOTIFIER'

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