Crossword Genius

Cat trapping tails of mice in spite (5)

Ross

I believe the answer is:

venom

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'spite' is the definition.
(synonyms)

I cannot understand how the rest of the clue works.

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(Other definitions for venom that I've seen before include "Poisonous liquid of snakes" , "Poisonous fluid" , "Snake's poison" , "Virulent feeling" , "Poison - spite" .)

I've seen this clue in The Sunday Times and The Times.
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