Crossword Genius

Infernal? Not at all! (4,4)

Ross

I believe the answer is:

like hell

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

'not at all' is the definition.
(I've seen this before)

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for like hell that I've seen before include "What a masochist might do" , "No way" , "recklessly" , "very quickly" .)

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