Spider, tick or scorpion (8)

I believe the answer is:

arachnid

(Other definitions for arachnid that I've seen before include "Animal class including spider, scorpion etc" , "tick for one" , "Member of the spider family" , "One of species including spiders, scorpions etc" , "Group including spiders and scorpions" .)

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

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