Crossword Genius

Fiendish nut fires associate for nothing, breaking contract (10)

Ross

I believe the answer is:

demoniacal

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'fiendish' is the definition.
(I've seen this before)

I don't understand the rest of the clue.

Can you help me to learn more?

(Another definition for demoniacal that I've seen is " Fiendish".)

I've seen this clue in The Hindu.
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