Crossword Genius

Wrong end of torpedo going off (3)

Ross

I believe the answer is:

sin

'wrong' is the definition.
(wrong can mean a sin or crime)

I cannot understand how the remainder of the clue works.

(Other definitions for sin that I've seen before include "Immoral action" , "Lapse against moral law" , "Moral offence" , "Breach of moral code" , "Serious offence" .)

I've seen this clue in The Independent and The Sun.
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