An eight-legged invertebrate animal in the subphylum Chelicerata (8)

I believe the answer is:

arachnid

(Other definitions for arachnid that I've seen before include "Incy Wincy Spider, say" , "web designer" , "Member of the spider family" , "Animal class including spider, scorpion etc" , "Spider, mite, tick etc.; had in car (anag.)" .)

I've seen this clue in The Independent.

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