I cant, as it turns devilish (7)

I believe the answer is:

satanic

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

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

'i cant as it turns' is the wordplay.
'i cant as' can be anagrammed to 'SATANIC'.
Though, I am not clear how this is indicated.

Can you help me to learn more?

(Other definitions for satanic that I've seen before include "Diabolical" , "wicked" , "Bad" , "Demonic" , "Like the Devil" .)

I've seen this clue in The Mirror.

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