Arachnid with poisonous stinging tail (8)

I believe the answer is:

scorpion

(Other definitions for scorpion that I've seen before include "Poisonous arachnid" , "Kind of arachnid with pincers and stinging tail" , "Sting-tailed creature" , "Poisonous creature" , "Small spider with pincers and stinging tail" .)

I've seen this clue in The Guardian.

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