Is an act of the devil (7)

I believe the answer is:

satanic

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

'is an act of the devil' is the definition.
I can't judge whether this defines the answer.

'is an act of the devil' is the wordplay.
'is an act' can be anagrammed to 'SATANIC'.
But, I'm not sure how the anagram is indicated.

Can you help me to learn more?

(Other definitions for satanic that I've seen before include "like Mephisto" , "Supremely evil" , "Very evil and cruel" , "Hellish" , "wicked" .)

I've seen this clue in The Irish Independent.

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