Mortal sin saint worked out is a wrong interpretation (14)

I believe the answer is:

mistranslation

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'a wrong interpretation' is the definition.
The answer and definition can be both related to communication as well as being singular nouns.
Maybe you can see a link between them that I don't see?

'mortal sin saint worked out' is the wordplay.
'worked out' indicates an anagram.
'mortal'+'sin'+'saint'='mortalsinsaint'
'mortalsinsaint' is an anagram of 'MISTRANSLATION'.

'is' acts as a link.

Can you help me to learn more?

I've seen this clue in The Irish Times.

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