Spider or scorpion (8)
I believe the answer is:
arachnid
I believe this clue is a double definition.
'spider' is the first definition.
(I've seen this in another clue)
'scorpion' is the second definition.
(thesaurus)
(Other definitions for arachnid that I've seen before include "Spider or scorpion, e.g." , "Class of animal including spiders and scorpions" , "Mite or tick, for example" , "Harvestman, possibly," , "Animal class including spider, scorpion etc" .)