Crossword Genius

It's normal to be put off a wicked act (6,3)

Ross

I believe the answer is:

mortal sin

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

'a wicked act' is the definition.
'mortal sin' can be an answer for 'act' (mortal sin is a kind of act). I'm not sure about the 'a wicked' bit.

'it's normal to be put off' is the wordplay.
'to be put off' is an anagram indicator.
'its'+'normal'='itsnormal'
'itsnormal' is an anagram of 'MORTAL SIN'.

Can you help me to learn more?

(Other definitions for mortal sin that I've seen before include "heinous act" , "It causes the death of the soul - not venial" .)

I've seen this clue in The Telegraph.
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