Most of the coven unleash some malice (5)

I believe the answer is:

venom

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'some malice' is the definition.
(synonyms)

I don't understand the remainder of the clue.

(Other definitions for venom that I've seen before include "Toxic substance" , "Snake poison" , "Virulence" , "acrimony" , "Poison - spite" .)

I've seen this clue in the Sydney Morning Herald.

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