Crossword Genius

Error causes pet to become pest instead

Ross

I believe the answer is:

sin

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'error' is the definition.
(a sin is a moral error)

I can't explain the remainder of the clue.

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(Other definitions for sin that I've seen before include "grave offence" , "Breach of moral law" , "Breach of moral code" , "Transgress" , "Breach of morality" .)

I've seen this clue in The Irish Independent.
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