Crossword Genius

Unholy fiend wiping brow (4)

Ross

I believe the answer is:

evil

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'unholy' is the definition.
(I've seen this in another clue)

I don't understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for evil that I've seen before include "Villainy" , "Live kind of badness" , "Extremely wicked" , "Depravity, wickedness" , "heinous" .)

I've seen this clue in The Times.
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