Ungodly act is disturbing - it's normal (6,3)

I believe the answer is:

mortal sin

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'ungodly act' is the definition.
'mortal sin' can be an answer for 'act' (mortal sin is a kind of act). I am not certain of the 'ungodly' bit.

'disturbing it's normal' is the wordplay.
'disturbing' indicates an anagram (I've seen this in other clues).
'its'+'normal'='itsnormal'
'itsnormal' with letters rearranged gives 'MORTAL SIN'.

'is' acts as a link.

Can you help me to learn more?

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

I've seen this clue in The Daily Express.

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