Vulgar rot even reveals how they kill victim (7)

I believe the answer is:

garrote

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'they kill victim' is the definition.
The definition suggests an adverb but the answer is not.

'vulgar rot even reveals' is the wordplay.
'reveals' indicates the answer is hidden within the clue.
'GARROTE' can be found hidden inside 'vulgar rot even'.

'how' is the link.

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I've seen this clue in The Irish Times.

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